The ayanamsa is the angle between the tropical zodiac, anchored to the equinox, and the sidereal zodiac, anchored to the stars. Subtracting it from a tropical position gives the sidereal position every Vedic chart uses. Different scholars fixed the zero star slightly differently, which is why several ayanamsas exist.

Why do two kundli sites show me different Moon signs?

Almost always because they apply different ayanamsas. Lahiri and Raman differ by about 87 minutes of arc, so any position within that distance of a sign border lands in different signs under the two settings. Check which ayanamsa each site uses before concluding either is wrong.

Which ayanamsa should I use?

Lahiri, also called Chitrapaksha, is the ayanamsa adopted by the Indian Calendar Reform Committee and is the default of most Indian panchangs and software. Raman and KP have their own schools. The sound practice is to pick one, know that you picked it, and read consistently within it.

The setting nobody mentions

Lahiri and Raman ayanāṁśa, the 87 minutes that can move your Moon

When two sites hand you two different Moon signs from the same birth details, neither has blundered. They disagree about a single number, and most never tell you which one they chose.

Graha Darpan·9 July 2026·Values computed with the Swiss Ephemeris

The short answer

An ayanāṁśa is the measured gap between the tropical and sidereal zodiacs. On 9 July 2026 the Swiss Ephemeris gives Lahiri at 24°13', Raman at 22°46', and KP at 24°07'. Lahiri and Raman differ by about 1°27', so any planet or lagna within that distance of a sign border changes signs between the two systems. Lahiri is the Indian Calendar Reform Committee's standard and the default here, printed on every chart.

One subtraction, many schools

Every sidereal position is a tropical position minus the ayanāṁśa. The astronomy of the planets is settled to fractions of an arcsecond. What the schools debate is where exactly the sidereal zodiac's zero should sit among the stars. N. C. Lahiri's committee fixed it against the star Chitra, and independent scholars, B. V. Raman most famously, argued for slightly different anchors. The result is a family of ayanāṁśas that agree the gap is about 24 degrees and disagree about the last degree of it.

Three respectable answers to one question, where does the sidereal zodiac begin.

When the choice changes your chart

Take a Moon at 24°00' of tropical Aries. Under Lahiri it becomes 29°47' of sidereal Pisces. Under Raman the same Moon is 1°14' of sidereal Aries. Same sky, same astronomy, different sign, different nakshatra, and a Vimshottari dasha seeded from a different star, which moves every period date in the life. Most positions are nowhere near a border and survive the choice untouched. The ones that sit within a degree and a half of a cusp are exactly the ones that generate confused emails between cousins using different websites.

Why we default to Lahiri and print it

Lahiri, formally Chitrapakṣa, is the ayanāṁśa India's Calendar Reform Committee adopted, the one behind most panchangs, government ephemerides, and mainstream software. Following it keeps your chart comparable with what most of India computes. But the deeper point is disclosure. Every chart here states its ephemeris, its ayanāṁśa, and its house system on the page, so when another site disagrees with us, you can find the setting responsible in one minute instead of wondering who blundered. Any calculator unwilling to name its ayanāṁśa is asking you to trust what it will not show.

Common questions

Two sites gave me different Moon signs. Which is right?

Check each site's ayanāṁśa first. A Moon near a sign border legitimately moves between Lahiri and Raman. Within one declared setting, computed with a real ephemeris, there is a single right answer.

Should I ever prefer Raman or KP?

If your family astrologer or school reads in one of those systems, staying consistent with your reader is worth more than any argument here. The error is mixing systems mid analysis, not choosing one.

Does the ayanāṁśa affect kundli matching?

Yes, exactly as it affects everything else, through the Moon's sign and nakshatra. Matching two charts computed under different ayanāṁśas is the classic way to get nonsense. Both charts here are always computed under the same declared setting.