Ruling · Mahālaya Amāvāsyā (Sarvapitṛ Amāvāsyā) · 1921

Saturday 1 October

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 286 minutes.

Decide it for

BaodingDelhiKolkataSingaporeSydneyJersey City

38°52′ N 115°28′ E · Asia/Shanghai · GeoNames 1816971

The two afternoons

One ghaṭī is 24 minutes. Aparāhṇa is 10th to 12th of 15 day muhūrtas.

Afternoon of Friday 30 September

Amāvasyā is absent from aparāhṇa. Not taken.

13:19 aparāhṇa beginsaparāhṇa ends 15:41
12:5513:1913:4314:0714:3114:5515:1915:4316:07

0 of 142 minutes covered

Afternoon of Saturday 1 October

Taken. The only afternoon Amāvasyā reaches.

13:19 aparāhṇa beginsaparāhṇa ends 15:40
12:5513:1913:4314:0714:3114:5515:1915:4316:07

142 of 142 minutes covered

Amāvasyā presentAparāhṇa, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Amāvasyā runs from 23:23 on Fri 30 Sep to 20:26 on Sat 1 Oct.

    1921-09-30T15:23:22Z → 1921-10-01T12:26:01Z

  2. 02

    Kāla

    Aparāhṇa is 10th to 12th of 15 day muhūrtas: 13:19–15:41 on the 30th, 13:19–15:40 on the 1st.

    aparahna: day-muhurta-10-12 · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Amāvasyā must be present during aparāhṇa. It covers 0 of 142 minutes on the 30th and 142 of 142 on the 1st.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103

  4. 04

    Tie-break

    Only one afternoon qualifies. No tie-break is needed.

    priority: unstated → only-day · margin 17137 s

  5. 05

    Ruling

    Mahālaya Amāvāsyā, Baoding, 1921: Saturday 1 October.

    confidence: determinate

Say it like this

In Baoding, Mahālaya Amāvāsyā 1921 falls on Saturday 1 October. Amāvasyā runs from 23:23 on Fri 30 Sep to 20:26 on Sat 1 Oct and covers all of aparāhṇa that afternoon.

ahargana.org/baoding/festivals/1921/mahalaya-amavasya · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 1 Oct
Ahargaṇa, classicalDisc centre, no refractionSat 1 Oct
compat-drikpanchangComparison profileSat 1 Oct
No institution has a recorded ruling for Baoding.

Institutional rulings are recorded with a source address, and are never edited to agree.

The rule, as data

/rules/mahalaya-amavasya · ruleset 2026.3-draft

Month
Bhādrapada, amānta
Pakṣa · aṅga
Kṛṣṇa · Amāvasyā
Kāla
Aparāhṇa
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 103

“K 30 Mahalaya amavasya (aparahnavyapini)” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103. The note on p. 106 gives the first day in a decreasing tithimāna and the second in an increasing one, when amāvāsyā covers the whole of aparāhṇa on both days; tithimāna is not computed.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceAmāvasyāAparāhṇa 30thCoveredAparāhṇa 1stCoveredRuled
Los Angeles07:23 → 04:2612:54142 min12:530 min30 Sep
Chicago10:23 → 07:2613:51142 min13:510 min30 Sep
Jersey City10:23 → 07:2612:57142 min12:560 min30 Sep
Port of Spain11:23 → 08:2613:08144 min13:080 min30 Sep
London16:23 → 13:2614:000 min14:000 min30 Sep
Durban17:23 → 14:2613:000 min13:0086 min1 Oct
Dubai19:23 → 16:2613:200 min13:20143 min1 Oct
Delhi20:53 → 17:5613:230 min13:22143 min1 Oct
Kolkata20:53 → 17:5612:380 min12:38143 min1 Oct
Singapore22:23 → 19:2613:070 min13:07145 min1 Oct
Sydney01:23 → 22:2613:000 min13:00149 min1 Oct
Suva03:23 → 00:2613:100 min13:10147 min1 Oct
Profile · tradition
pac-rp@2026.1 · smarta
Rule
mahalaya-amavasya@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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