Do I need my partner's birth time?

Planet-to-planet aspects need only dates; house overlays and the Ascendant need both birth times and places.

What does the 36-point Jyotish score measure?

Ashta Kuta scores eight factors from both natal Moon nakshatras, to 36 points; the 7th house, Venus and D9 are read alongside it.

Synastry: reading compatibility by comparing two birth charts

Synastry overlays two birth charts and reads how one person's planets touch the other's planets and houses. It is used for romance and marriage, and also for business partners and family.

GenesisCore Premium Western result screen (example from a public figure's birth data)

Key planets

Planet / point	Theme in compatibility
Sun	Whether life directions support each other
Moon	Emotional rhythm and comfort
Venus	Tastes, values, how affection is shown
Mars	Pace, drive and how conflict appears
Ascendant	First impressions

Aspects and house overlays

Conjunctions, trines and sextiles between the charts are read as easier, oppositions and squares as stimulating or challenging. Where one person's planets fall in the other's houses shows which area of life the relationship touches; the 7th house of partnership is central.

Kuta matching in Jyotish

Jyotish commonly uses Ashta Kuta, which scores eight factors from the two natal Moon nakshatras for a total of 36 points, alongside the 7th house, Venus and the Navamsa (D9).

Reading it well

Compatibility is not decided by one aspect or score. Knowing your own chart first, in both systems, makes any comparison clearer; GenesisCore reads your chart's character, strengths and timing in Western astrology and Jyotish.

FAQ

Do I need my partner's birth time?: Planet-to-planet aspects need only dates; house overlays and the Ascendant need both birth times and places.
What does the 36-point Jyotish score measure?: Ashta Kuta scores eight factors from both natal Moon nakshatras, to 36 points; the 7th house, Venus and D9 are read alongside it.

FREE TOOL · NO SIGNUPSynastry calculator: compare two charts' Sun, Moon, Venus and Mars signs and aspects →

GenesisCore

Read your own chart through both systems.

Try one system free. Standard (four PDFs) and Premium (six PDFs) are one-time purchases that include both Western astrology and Jyotish.

Launch prices until Nov 15, 2026, 23:59 JST: Standard 2,980 JPY → 2,235 JPY / Premium 5,980 JPY → 4,485 JPY

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