Understand the result
Sun, Moon & Rising Compatibility Calculator: the complete guide
Use this free sun, moon & rising compatibility calculator to calculate how two people’s Sun, Moon and Rising signs meet. The result is built from astronomical positions and visible chart evidence—not a name match, canned score or generic date-range reading.
What you are calculating
What the Sun, Moon & Rising Compatibility Calculator calculates
The Big Three compatibility calculator compares identity and direction through the Sun, emotional needs through the Moon, and the immediate style of engagement through the Ascendant. It is a useful first layer, calculated from both birth records rather than guessed from dates alone.
The form asks only for inputs that materially change the calculation. Locations are converted to coordinates and IANA timezones, ambiguous clock changes are handled explicitly, and the selected house system is preserved in the result.
Sun to Sun
Shows how each person’s priorities, vitality and preferred way of expressing identity relate.
Moon to Moon
Highlights similarities and differences in instinctive responses, comfort and emotional regulation.
Rising sign contacts
Describes first impressions and approach, but requires accurate birth times because the Ascendant changes quickly.
Interpret with context
The Big Three are a doorway, not the whole relationship
Use the Sun, Moon and Rising signs to orient yourself, then check the exact aspects and the rest of both charts. Two people can share compatible elements and still communicate very differently; they can also have contrasting Big Three placements supported by strong Venus, Mercury or Saturn contacts.
Identity
Sun contacts show whether the two people readily recognise and energise each other’s direction.
Safety
Moon contacts matter when considering everyday closeness, care and reactions during stress.
First response
Ascendant contacts colour the immediate chemistry and social rhythm, not the entire bond.
Precision without false certainty
Accuracy and limits of this sun, moon & rising compatibility calculator
Both Rising signs require exact local birth times and places. If either time is unknown, a responsible calculator should say so rather than silently using noon.
Astrological interpretation is symbolic rather than a scientifically validated prediction. Use it as a structured reflection on calculated patterns, not as proof of compatibility, fate, character or a guaranteed event.
Useful answers
Frequently asked questions
Is the sun, moon & rising compatibility calculator free?
Yes. You can calculate and view the core result without a card. A complete birth chart is also free to calculate; optional long-form readings are clearly separated.
What birth details do I need?
Use the date, local time and place recorded for the birth. If a time is unknown, the calculator should identify what remains reliable instead of inventing houses or angles.
Which house systems can I use?
You can choose Placidus, Koch, Whole Sign, Equal House, Morinus, Porphyry, Regiomontanus or Campanus wherever houses are part of the result.
How are the positions calculated?
The platform uses precise astronomical calculations, timezone-aware local birth data and location coordinates. Interpretation is a separate layer built from that chart evidence.
Are the Sun, Moon and Rising signs enough for compatibility?
They are a useful introduction, but no. Mercury, Venus, Mars, Saturn, houses and exact cross-chart aspects add essential relationship context.
Can astrology tell me how someone secretly feels?
No. A chart can describe relational patterns and needs, but it cannot verify another person’s private thoughts or feelings.
Does this guarantee compatibility or marriage?
No. The result describes supported areas of ease, attraction, friction, and repair. It cannot guarantee commitment or an outcome.
What if one birth time is unknown?
Reliable planet-to-planet contacts can remain useful, but angles, houses, and time-sensitive Moon claims must be removed or marked uncertain.
Can I compare friends, family, or business partners?
Yes. Relationship chart techniques can examine any two consenting, privately saved profiles; romantic language should only be applied when it fits the relationship.
Are both people’s details private?
Birth records and saved results are handled as private account data and are used to calculate and restore the requested chart context.
What is the difference between Synastry, Compatibility, and Composite?
Synastry and compatibility compare how two individual charts interact. Composite calculates a midpoint chart for the relationship dynamic itself.
Can astrology tell me whether I should stay or leave?
No chart should make that decision for you. The result can provide language for needs, communication, attraction, pressure, and repair. Your lived safety, values, and choices remain primary.
Your whole chart is already the next answer
Turn one result into a complete picture of you.
Calculate every placement, house and major aspect, then see the core patterns connecting them.