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Amavasya Date Calculator | New Moon Days by Year

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The Amavasya Date Calculator finds when the Moon−Sun elongation crosses 0° each lunar month — the Amavasya tithi — for your chosen year and regional panchang (North/South Indian), listing each Amavasya's civil date and its tithi window for rituals like tarpanam.

Last updated: September 2026 · Free · No sign-up required

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Results

Enter values above and click Calculate to see your result instantly.

Quick reference

Amavasya occurrences per lunar year: 12 (13 in adhika years). Key observances:

AmavasyaMonthSignificance
MahalayaBhadrapadaPitru Paksha ends
DeepavaliKartikaLakshmi puja
MauniMaghaSilent observance

public Location matters

Tithi and nakshatra boundaries depend on where you are — enter your city's coordinates for precise results.

schedule Ayanamsa

Calculations use the Lahiri (Chitrapaksha) ayanamsa, the standard for Vedic charts.

menu_book Panchang basis

Results follow drik-panchang style astronomical computation, not printed-table approximation.

school Traditions differ

Some regions use Surya Siddhanta conventions; where traditions conflict, your family panchang wins.

lightbulb A real example — timing tarpanam on Mahalaya Amavasya 2026

A family in Chennai wants the exact ritual window for Mahalaya Amavasya — the new moon closing Pitru Paksha in late September 2026.

Result: The calculator finds the year's 0° Moon–Sun elongation crossings — an evening reading of 355° elongation is floor(355/12) = 29, the 30th tithi, i.e. Amavasya — and lists the Bhadrapada/Ashwin crossing with its full local window (often shorter than 24 hours), so tarpanam is performed while Amavasya actually prevails rather than on a nominal calendar date.

What this means: This is where the North/South option matters: North Indian (Purnimanta) calendars assign the tithi by the sunrise rule while South Indian Amanta months end at Amavasya itself, so near a boundary the two conventions can place the observance on adjacent civil dates. The calculator shows both assignments and lets the family's tradition decide.

Formula & methodology

Formula: Tithi = ⌊(Moon−Sun elongation) ÷ 12°⌋; Nakshatra = ⌊Moon longitude ÷ 13°20'⌋; Vimshottari lord sequence Ketu→Venus→Sun→Moon→Mars→Rahu→Jupiter→Saturn→Mercury

How Amavasya dates are detected

Amavasya is the moment the Moon–Sun elongation crosses 0° — the 30th tithi, when elongation sits in the 348°–360° band. The calculator scans the year's ephemeris for each crossing and reports the civil date plus the tithi's exact local span, since the ritual window (for example for tarpanam) is the hours Amavasya actually prevails, not the whole calendar day.

A regional calendar option changes the assignment at boundaries: Purnimanta (North Indian) reckoning attaches the tithi to the civil date by the sunrise rule, while Amanta (South Indian) months terminate at Amavasya itself. Both are computed from the same crossing; the calculator displays the resulting dates side by side where they differ.

Frequently asked questions

What is Amavasya?
The new-moon tithi — when the Moon sits between the Sun and Earth and is invisible. It is the 15th tithi of the Krishna paksha (waning fortnight).
Why do Amavasya dates differ North vs South India?
Panchangs differ on which day a tithi 'belongs' to: North Indian calendars use sunrise-to-sunrise counting, South Indian (Amanta) months end at Amavasya — dates can shift by a day at boundaries.
What rituals are done on Amavasya?
Tarpanam (water offerings to ancestors), pitru worship at temples, and special observances like Diwali's Lakshmi puja fall on the new moon of Kartika.
How often does Amavasya occur?
Every 29.5 days — twelve to thirteen times a year, once per lunar month.

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