The chart can show two truths at once

You can want someone intensely and still hesitate when you picture ordinary life together. Synastry has a language for that split. One set of contacts may quicken the body, sharpen attention, and make every meeting feel charged. Another may show different habits around money, time, loyalty, family, faith, work, or freedom. Neither signal is fake. They answer different questions.

The first question is attraction. What wakes desire? In a chart comparison, Venus and Mars often bring that answer into focus. Venus describes taste, affection, pleasure, and the values that shape how love is offered. Mars describes pursuit, heat, initiative, anger, and the way a person goes after what they want. A strong contact between them can feel immediate. It may be soft and inviting, or it may carry friction that keeps the two people circling back to each other. Attraction can also reveal a lesson in timing. One person may want a clear declaration while the other wants room to discover the bond slowly. The contact explains the pull; the signs show the pace.

The second question is shared direction. What do you build when the date ends and the lights come on? Here you look beyond one exciting contact. Venus still matters because values live there, but you also consider the Sun, Mercury, Moon, Saturn, sign elements, house overlays when birth times are known, and the overall pattern of major aspects. A warm Sun-Venus contact can show appreciation and a sense that the other person embodies something you admire. Mercury contacts describe how you exchange plans and explain what matters. Moon contacts show whether the bond feels livable in the nervous system, not just beautiful in theory. Saturn asks what can hold shape over time.

This is why a synastry reading should not produce a single verdict such as chemistry good, values bad. Astrodienst describes synastry as a comparison of two birth charts, with the planets of each person placed together so their inter-chart aspects and house overlays can be read. It also stresses that challenging aspects can demand effort while harmonious ones can become passive. Astrology.com makes the same broad point through its discussion of houses, elements, aspects, and planets. The chart is a pattern of interaction, not a scorecard.

The distinction becomes especially important when the relationship is new. Early attraction naturally takes up more space than shared direction because desire has an immediate voice. It shows up in the body, the messages you reread, the plans you make without thinking. Values move more quietly. They appear when someone handles a cancelled plan, speaks about an ex, divides a bill, or responds to your need for time alone. A chart reading that honors both tempos keeps the first rush from being mistaken for the whole relationship.

So begin with a clean distinction. Attraction tells you what pulls you toward the relationship. Shared values tell you what you may repeatedly have to choose inside it. Sometimes the pull becomes a bridge. Sometimes it exposes a difference you can no longer romanticize. The useful reading shows you which is happening.

Sources: Astrodienst: Partner Horoscopes; Astrodienst Astrowiki: Synastry; Astrology.com: What Is a Synastry Chart? Birth Chart Compatibility

What information do you need before you interpret the conflict?

A precise reading starts with precise inputs. The traditional foundation is two natal charts calculated from each person's birth date, exact or closely known birth time, and birth place. Synastry then compares the planets, angles, and houses across those charts. The birth time matters most when you want to use the Ascendant, Descendant, Midheaven, or house overlays. Without it, you can still read sign placements and many planet-to-planet contacts, but you should not pretend to know where one person's planets fall in the other's houses.

For this guide, separate what you know into three columns. Record the sign of each person's Sun, Moon, Mercury, Venus, and Mars. Add the exact degree when you have it. Then record the major cross-chart aspects, including the planets in each contact, the aspect name, the exact orb, and whether your chosen method marks it as applying or separating. Keep the two directions visible. Your Venus to his Mars is not quite the same lived story as his Venus to your Mars, even when both contacts appear in the same pair of signs.

Degrees keep the reading honest. A sign pairing can suggest a relationship between two placements, but an aspect describes their angular conversation. A conjunction is near 0 degrees, a sextile near 60, a square near 90, a trine near 120, and an opposition near 180. The distance from the exact angle is the orb. Astrodienst's aspect reference defines these major aspects and explains that the accepted orb varies by planet and aspect. Its partner-chart FAQ says its synastry drawing uses half the natal orb because twice as many planets create twice as many possible contacts.

Your report may use a different convention. That doesn't make the comparison useless. It means you should state the rule before ranking the results. In this publication's Synastry Comparison Report, the working scope is supplied Moon, Venus, and Mars signs, optional degrees, selected major aspects, and a six-degree orb. It does not calculate natal positions from birth details, houses, or a complete birth chart. If you only have sign placements, stay at the sign layer. If you have degrees, move carefully into the aspect layer.

Missing data changes the kind of question you can answer. No birth time? Leave houses and angles open. No degrees? Don't call a same-element pairing an exact trine. Only one person's placements? You have a natal starting point, not synastry. The boundary is useful. It prevents a dramatic interpretation from resting on a contact you never actually established.

You can also record confidence beside each input. High confidence means an exact degree and a birth time you trust. Medium confidence may mean a rounded degree or a time close enough for planets but not angles. Low confidence means a sign placement without degrees, or a Moon that may change signs that day. This small note changes the tone of the reading. You can be direct about a clear Venus sign and careful about a house claim that depends on an uncertain time. When a placement itself is uncertain, list the two possible readings and ask which one matches the person's known way of loving or reacting. That keeps the interpretation open in the right place, instead of making the whole chart vague.

Sources: Astrodienst: Partner Horoscopes; Astrodienst Astrowiki: Synastry; Astrodienst Astrowiki: Aspect

Read attraction first, but don't let it lead the whole reading

Attraction deserves a real reading. It is not a shallow layer that serious astrology should hurry past. Desire can tell you where the relationship has life, courage, and creative force. It can also tell you where you are likely to keep investing attention, even when another part of the chart asks for a slower look.

Start with Venus and Mars. Venus-Mars conjunctions, oppositions, squares, trines, and sextiles can all create a strong exchange, though they do not all feel the same. A conjunction blends the functions. You may experience the other person as immediately desirable, or as someone whose style and drive seem to belong in the same room. A trine can make attraction flow without much explanation. A sextile often opens a door that both people still need to walk through. A square creates heat through difference. The want is real, but the two people may want, initiate, or respond at different speeds. An opposition can create a magnetic polarity. One person embodies a style of desire the other both recognizes and seeks.

The planets tell you what is meeting. The signs tell you how. Venus in Taurus may prize steadiness, physical comfort, and dependable pleasure. Mars in Sagittarius may pursue candor, adventure, and room to move. Put those placements in contact and the attraction might be powerful precisely because each person carries a quality the other lacks. But the same difference can become a practical question. How often do we go out? What counts as commitment? Does comfort feel like love to one person and stagnation to the other?

Then check whether the attraction contact is repeated elsewhere. A Venus-Mars aspect supported by Sun-Venus, Moon-Venus, or a clear Mercury connection has more ways to become a relationship with a daily language. A single Venus-Mars contact can still matter greatly, especially when it is close, but you should not make it carry emotional safety, friendship, shared aims, and long-term structure all by itself. Astrodienst's aspect guidance says the nature of the planets must be considered before the aspect is interpreted. That simple order prevents a square from becoming automatically bad or a trine automatically sufficient.

Use this question: what does the attraction make possible? It might make difficult honesty easier because both people stay engaged. It might keep a confusing bond alive long after its practical terms have become clear. It might turn a difference in style into a source of fascination. Name the gift and the demand. Chemistry is not the enemy of values. Unexamined chemistry is.

Notice who is carrying which planet. The Venus person may feel desired, appreciated, or evaluated through the Mars person's pursuit. The Mars person may feel activated by the Venus person's style and response. In an opposition, the two roles can alternate as the relationship develops. In a square, each person may feel that the other is pressing the wrong button. This is why one sentence such as there is chemistry tells too little. Ask who wants, who waits, who initiates, and who decides what counts as enough.

Sources: Astrodienst Astrowiki: Synastry; Astrodienst Astrowiki: Aspect; Astrology.com: What Is a Synastry Chart? Birth Chart Compatibility

Find shared values in more than one planet

Shared values are not the same as having matching Sun signs. A person can admire your identity and still disagree with your pace. Two people can share a spiritual outlook but handle money in opposite ways. Synastry becomes more useful when you ask which value is being described, and which planet carries it.

Venus is the first place to look. It shows what feels pleasing, what you respect, and how you give and receive affection. Venus contacts can reveal agreement around taste, generosity, aesthetics, social ease, and the kind of partnership each person enjoys. Sun-Venus contacts often create appreciation. The Venus person may value the Sun person's manner of being, while the Sun person may feel welcomed and affirmed. That can be a meaningful value bridge. It still doesn't settle every question about money, work, family, or commitment.

The Sun adds direction and identity. When one person's Sun connects with the other's Venus, the relationship may feel proud, warm, and personally affirming. When the Suns or Sun and Mercury connect by sign or aspect, the two people may understand each other's purpose more readily. But a Sun contact can also show that one person shines in a way the other admires without actually sharing the same priorities. Admiration is a bridge. It is not a contract.

Mercury shows whether values can be discussed without distortion. Look at Mercury-Mercury, Mercury-Venus, Mercury-Sun, and Mercury-Moon contacts. A flowing Mercury contact may help you put different priorities into words. A tense contact may create arguments that are not really about the grocery list, the holiday, or the move. They may be about what each person thinks those choices mean. Mercury square Venus, for example, can show different tastes or ways of expressing affection. It can also provide a useful translation problem if both people stay curious.

Saturn gives the value question weight. Saturn contacts to personal planets can feel serious, binding, demanding, or slow. They may describe duties that make a relationship durable, but they can also make one person feel judged or managed. Astrology.com calls Saturn difficult but important in synastry, especially in relation to enduring partnership. Read the contact in both directions. Ask whether Saturn is offering a container for desire or placing a burden on one person's choices.

Finally, compare elements and modes. Fire and air often energize one another through movement, ideas, and possibility. Earth and water can create a shared instinct for care, continuity, and protection. That is a starting lens, not a ruling. An earth-heavy person may love a fire person's boldness. A water-heavy person may need the directness of air. The key is not sameness. It is whether the difference can become a shared practice.

Shared values can also be split into core and flexible values. A preference for quiet weekends may bend. A need for honesty about exclusivity may not. A preference for one style of home can be negotiated. A refusal to share financial responsibility may change the entire structure of a partnership. Astrology helps you see the style of the disagreement. You still have to decide which parts are preferences and which parts are promises you cannot make.

Two overlapping circular diagrams appear above a dark landscape; the left shows a crescent-covered orb and a female symbol, while the right shows a sun face above a globe framed by leaves.
Two overlapping circular diagrams appear above a dark landscape; the left shows a crescent-covered orb and a female symbol, while the right shows a sun face above a globe framed by leaves.
A thought to begin with

When attraction and shared values point in different directions, don't ask which one cancels the other. Read them as two different relationship functions. Venus and Mars can describe heat, pursuit, and erotic pull, while Venus, the Sun, Mercury, the Moon, and Saturn show how affection, priorities, communication, emotional safety, and commitment might be carried. Start with the tightest major contacts, then compare the signs and the planets involved. A close Venus-Mars square can make desire vivid and persistent. It doesn't by itself tell you whether you want the same life. A looser harmony may matter less than a precise conflict between Venus and Saturn, or a Moon contact that changes how safe the bond feels. Use the chart to name the conversation you need: what do we value, what do we need daily, and how will we handle the places where desire outruns agreement? The reading becomes useful when it helps you choose that conversation clearly, together, and without rushing past the hard part. That is enough to begin well.

Sources: Astrodienst Astrowiki: Synastry; Astrodienst Astrowiki: Aspect; Astrology.com: What Is a Synastry Chart? Birth Chart Compatibility

Let the Moon decide whether the attraction feels livable

Attraction brings you closer. The Moon tells you what happens once closeness becomes ordinary. It describes instinct, comfort, private needs, and the way each person restores themselves. That makes it central when attraction and shared values seem to disagree. You may share an exciting Venus-Mars contact but discover that your emotional rhythms do not give either person enough rest.

Read Moon contacts with the same care you give Venus and Mars. Moon-Venus can connect affection with emotional need. The Moon person may feel cherished by the Venus person's style, while the Venus person may find the Moon person's emotional life tender and appealing. Moon-Sun can create recognition between identity and instinct. Moon-Mercury can make feelings easier to name. Moon-Saturn can offer steadiness and protection, or it can make vulnerability feel evaluated. The aspect, signs, dignity, and wider pattern decide which expression has the most room.

The Moon also reveals the hidden price of a value difference. Imagine one person values independence because solitude restores her. The other values constant availability because presence proves care. Venus-Mars may keep the desire bright. Moon contacts may show that each person's way of feeling safe asks for a different daily schedule. Neither person is wrong in astrological terms. But the relationship needs a design that honors both needs, or one person will keep translating deprivation as passion.

This is where a square can be more useful than a vague harmony. A Moon square Mars may show that one person's emotional timing collides with the other's action or anger. That contact can keep the relationship vivid, but it asks for a repair method. A Moon trine Saturn may make responsibility feel calming rather than heavy. A Moon opposition Venus can pull comfort and pleasure across a line, creating an ongoing negotiation between what feels secure and what feels desirable.

Ask three practical questions. What does each person do when tired? What kind of reassurance actually works? Which ordinary habit makes each person feel loved? The chart doesn't replace those answers. It helps you ask them with sharper language. If the answers can coexist, the value difference may be workable. If only the chemistry has a place, the reading has found its limit.

Don't read the Moon only through sweetness. A comfortable Moon contact can make the relationship feel familiar, but familiarity may also preserve habits that need attention. A tense contact can make you aware of the exact point where comfort breaks down. That awareness gives the couple something to practice. The real test is whether each person can recognize the other's need before the need becomes a demand.

Sources: Astrodienst Astrowiki: Synastry; Astrodienst Astrowiki: Aspect; Astrology.com: What Is a Synastry Chart? Birth Chart Compatibility

Rank the aspects by closeness, repetition, and function

A synastry chart can show more contacts than you can responsibly interpret at once. Rank them. Otherwise the most dramatic phrase wins, even when it belongs to a wide or minor contact that the rest of the chart doesn't repeat.

First, rank exactness. A major aspect within one degree deserves more attention than the same aspect at six degrees, all else being equal. The smaller the orb, the more concentrated the contact usually feels in a sign-based reading. Your chosen method still matters. Astrodienst publishes different orb tables for different chart drawing styles and explains that its partner-chart display narrows the drawn orb. This is a reminder that orb is a method choice, not a magical switch.

Second, rank repetition. If Venus-Mars chemistry appears as a close opposition and the same planets also connect with the other person's Moon or Sun, the theme has several channels. If attraction appears once while every other major contact concerns distance, duty, or misunderstanding, don't let the one spark become the entire weather report. Repetition doesn't mean a guaranteed outcome. It means the theme has more than one route into the relationship.

Third, rank function. Name the job of each contact. Venus-Mars describes desire and pursuit. Moon-Venus describes emotional affection and pleasure. Sun-Venus describes appreciation and value recognition. Mercury contacts describe exchange. Saturn contacts describe structure, responsibility, and pressure. Jupiter can enlarge warmth, generosity, or expectation. Outer-planet contacts can make a bond feel compelling, destabilizing, idealized, or transformative, but they need the personal planets and the natal charts around them for a grounded reading.

Fourth, check the aspect type. A conjunction fuses. An opposition polarizes and asks for balance. A square creates a recurring problem or an active engine. A trine offers ease that may need conscious use. A sextile offers an opening. Astrodienst's aspect guide notes that difficult aspects can motivate development and harmonious aspects can sometimes become lethargic. That's why a square is not a verdict against love, and a trine is not proof that two people will choose the same life.

You can make a small working table. Put the contact in the first column. Put its orb in the second. Name its relationship function in the third. In the fourth, write the behavior or conversation it asks you to examine. The last column is the exception: what could make the contact easier or harder? This turns a chart from a pile of symbols into an ordered argument.

If two contacts tie, choose the one that affects a more personal function. A close Venus-Mars contact usually deserves attention before a wide contact to a generational planet. A close Moon-Saturn contact may deserve attention before a flattering but broad Sun-Jupiter contact if the question is emotional reliability. This isn't a universal hierarchy for every astrologer. It is a practical reading rule: match the weight of the contact to the question you are actually trying to answer.

Sources: Astrodienst: Partner Horoscopes; Astrodienst Astrowiki: Synastry; Astrodienst Astrowiki: Aspect

A worked example: when desire is loud and values need translation

Imagine Maria comparing known placements with Daniel's. This is an illustrative example, not a calculated personal chart. Maria has Venus in Leo and Mars in Scorpio. Daniel has Mars in Aquarius and Venus in Virgo. Assume, for the purpose of the example, that the supplied degrees establish a close Venus-Mars opposition between Maria's Venus and Daniel's Mars, a close Venus-Mars square between Maria's Mars and Daniel's Venus, and a supportive Sun-Venus contact. We are using the stated contacts as teaching material, not claiming that any real couple holds these positions.

The first pass is unmistakable. Maria's Leo Venus wants warmth, pride, visible affection, and a love that feels wholehearted. Daniel's Aquarius Mars may pursue through freedom, surprise, ideas, and a refusal to be boxed in. Their opposition can create a compelling polarity. Maria may find Daniel's independence exciting. Daniel may be drawn to Maria's presence and expressive confidence. They don't pull toward each other because they are identical. They pull because each person carries a quality the other notices.

The second contact changes the question. Maria's Scorpio Mars moves with intensity, privacy, and emotional focus. Daniel's Virgo Venus may show love through helpfulness, refinement, practical care, and attention to details. The square can create strong desire, but the love languages may miss each other. Maria may experience Daniel's corrections as a cooling of passion. Daniel may experience Maria's force as pressure or emotional risk. The attraction stays real. The translation problem stays real, too.

The supportive Sun-Venus contact gives them a bridge. They can admire one another. Maria may respect Daniel's thoughtful skill. Daniel may enjoy Maria's courage and creative force. But the bridge doesn't erase the squares. It tells them where appreciation can be practiced. Daniel can say what he values before offering a fix. Maria can ask for intensity without making every pause mean rejection. Those are not generic relationship tips pasted onto the chart. They are concrete expressions of the planetary functions already in the comparison.

Now add the value test. Suppose Maria wants a visibly committed partnership with shared social life, while Daniel wants a relationship that protects large areas of independence. The chart doesn't decide which plan wins. It shows why the disagreement may feel erotic before it feels easy. Maria's Venus is drawn to Daniel's difference. Daniel's Mars is energized by Maria's certainty. If they treat fascination as evidence of agreement, the same contacts become a loop. If they name the difference, the contacts can become a negotiation.

The ranking is therefore clear. First, honor the close Venus-Mars contacts as genuine attraction and friction. Second, use the Sun-Venus contact to identify respect and a shared language of appreciation. Third, bring in the Moon, Mercury, and Saturn contacts before making any judgment about emotional life or durability. If those layers support translation and structure, the relationship has material to work with. If they repeat distance, criticism, or incompatible duties, desire may remain the brightest part of the chart.

Notice what the example does not do. It doesn't call Maria and Daniel compatible or incompatible. It doesn't turn a sign into a personality sentence, and it doesn't claim that an opposition must become a breakup or that a square must become growth. The point is narrower and more useful. The contacts show why the same difference can feel attractive at first and demanding later. The next layer tells you what conversation could keep that difference from becoming resentment.

Two adjacent circular charts sit on a dark starry background; the left shows a sun, a small dark orb, and curved connecting lines, while the pale right chart has a compass-like center, dots, leaves, and zodiac symbols.
Two adjacent circular charts sit on a dark starry background; the left shows a sun, a small dark orb, and curved connecting lines, while the pale right chart has a compass-like center, dots, leaves, and zodiac symbols.

The strongest exception: a beautiful pattern may still meet a hard life

The strongest exception to any attraction-versus-values reading is not another aspect. It is the natal chart and the lived person. Synastry activates patterns between two people, but it does not replace either individual chart. Astrodienst specifically advises interpreting each horoscope as a whole before interpreting the relationship between them. It also says maturity, which no horoscope can reveal, matters greatly.

That point protects the reading from two opposite mistakes. The first is romantic inflation. A powerful Venus-Mars contact can feel so alive that you treat every disagreement as evidence of depth. The second is mechanical rejection. A difficult Moon or Saturn contact can sound so severe that you miss the patience, skill, and self-knowledge that give it a constructive form. The chart describes a field of experience. People still meet it through character, choice, and timing.

A second exception concerns missing layers. If you know only the signs of Venus and Mars, you can discuss attraction and style. You cannot responsibly announce that the relationship lacks emotional compatibility because you have not examined the Moon, or that it has lasting structure because you have not examined Saturn. If birth times are missing, you cannot use houses to claim that one person activates the other's partnership axis. A careful reading keeps the unknown visible without making it dramatic.

A third exception is the difference between an aspect's potential and its expression. A square may show a recurring place of friction. It can become a skill when both people learn the rhythm of the conflict. An opposition may invite balance, but it can also turn into a tug of war if each person insists the other must become more like them. A trine may make affection easy, but ease can remain unchosen. The interpretation must include the demand of the aspect, not just its attractive description.

The same caution applies to the word intensity. Intensity can mean desire, fear, concentration, devotion, conflict, or a rapid change in the bond. Pluto or Neptune contacts may deepen the feeling of significance, but they don't tell you whether the relationship has clear terms. Uranus can bring excitement and freedom, yet it can also make the rhythm unpredictable. Read an outer-planet contact as a modifier of the personal story, not as a replacement for the personal story. Start with Venus, Mars, Moon, Mercury, and Saturn when your question is how two people will live together.

Use this final pressure test. Does the chart's promise appear in behavior? Does the person's way of loving match the values you say you share? Can the two of you make a plan for the difference without asking one person to disappear? If the answer is no, don't use astrology to argue with what you already know. If the answer is yes, don't use one tense contact to dismiss the work you are actually doing.

There is also a difference between a relationship that asks you to grow and one that asks you to betray yourself. Astrologers often read challenging contacts as invitations to develop a new skill. That invitation has a boundary. Growth can ask for patience, clearer speech, or a wider view. It should not require you to accept contempt, abandon your safety, or call chronic neglect a spiritual lesson. The chart can name a pattern. It cannot make harmful behavior loving.

Sources: Astrodienst Astrowiki: Synastry; Astrodienst Astrowiki: Aspect; Astrology.com: What Is a Synastry Chart? Birth Chart Compatibility

Turn the reading into one conversation you can have

A good synastry reading ends with a better question, not a louder label. Once you have ranked the chart, choose the contact that creates the most useful tension between attraction and shared direction. Then turn its symbolism into one ordinary conversation.

If Venus-Mars is strong but your values differ around commitment, ask: What does choosing each other look like in the next six months, in actions we can both name? If the difference concerns money, ask: Which expenses, risks, and forms of generosity feel shared, and which must stay separate? If it concerns independence, ask: How much time alone helps each of us return with more love rather than less? If it concerns family or faith, ask: Which tradition do we want to practice together, and where do we need room to remain different?

Keep the question specific. Shared values are not a mood. They appear in calendars, budgets, introductions, boundaries, apologies, and plans. Attraction is not a promise. It is energy. You learn what that energy can build by giving it a task and watching what happens.

You can also return to the chart after the conversation. Did the Moon's needs become clearer? Did Mercury give you a way to speak without turning the issue into a character attack? Did Saturn reveal a structure that would support both people, or a burden that only one person would carry? Did the close aspect become more understandable once you saw the real choice beneath it? This is the living part of interpretation. The symbols sharpen the question. The answer grows through attention.

For a comparison based on supplied placements, write down your Moon, Venus, and Mars signs first, then add exact degrees if you have them. A Synastry Comparison Report can organize those placements and selected major aspects using a six-degree orb. It can help you see which contacts deserve the first conversation. It won't calculate missing natal positions, houses, or a complete birth chart, so the report remains honest about what your inputs can show. That means you can compare known placements without pretending that unknown chart layers have been settled. Bring the written comparison into the conversation only as a prompt. Let the person's answer remain larger than the symbol.

Start with this sentence: I'm strongly drawn to you, and I want to understand whether our way of building a life can meet that desire. Then ask the question your highest-ranked value difference requires. Listen to the answer in words and in plans. That is how attraction becomes information, and how synastry becomes useful.

Give the conversation a second step. After each person answers, ask what a small experiment would look like this week. If the issue is independence, try a clear plan for time apart and time together. If it is money, agree on one transparent expense rather than arguing about an abstract future. If it is affection, ask each person to name one action that lands as love. Then return to the result. A chart reading becomes practical when it helps you observe a pattern instead of merely naming one.

You don't need to solve every difference in one sitting. You do need to know whether both people are willing to see it. That is the final ranking outside the chart. Desire may open the door, and shared values may decide which rooms you can furnish together. A good conversation tells you whether the other person stays present when the subject gets ordinary and helps build an arrangement that leaves both people recognizable to themselves. That answer matters more than a dazzling contact read in isolation.

Sources: Astrodienst: Partner Horoscopes; Astrodienst Astrowiki: Synastry; Astrodienst Astrowiki: Aspect

Sources & further reading

Synastry Comparison Report

Enter known placements for two people. Get an input-by-input comparison, selected aspect calculations and a clear record of what remains uncertain.

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