Ruling · Mahālaya Amāvāsyā (Sarvapitṛ Amāvāsyā) · 1925

Thursday 17 September

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 74 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 Thursday 17 September

Taken. The only afternoon Amāvasyā reaches.

13:27 aparāhṇa beginsaparāhṇa ends 15:56
13:0313:2713:5114:1514:3915:0315:2715:5116:15

149 of 149 minutes covered

Afternoon of Friday 18 September

Amāvasyā is absent from aparāhṇa. Not taken.

13:26 aparāhṇa beginsaparāhṇa ends 15:55
13:0213:2613:5014:1414:3815:0215:2615:5016:14

0 of 148 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 10:58 on Thu 17 Sep to 12:12 on Fri 18 Sep.

    1925-09-17T02:58:25Z → 1925-09-18T04:12:16Z

  2. 02

    Kāla

    Aparāhṇa is 10th to 12th of 15 day muhūrtas: 13:27–15:56 on the 17th, 13:26–15:55 on the 18th.

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

  3. 03

    Rule

    Amāvasyā must be present during aparāhṇa. It covers 149 of 149 minutes on the 17th and 0 of 148 on the 18th.

    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 4443 s

  5. 05

    Ruling

    Mahālaya Amāvāsyā, Baoding, 1925: Thursday 17 September.

    confidence: determinate

Say it like this

In Baoding, Mahālaya Amāvāsyā 1925 falls on Thursday 17 September. Amāvasyā runs from 10:58 on Thu 17 Sep to 12:12 on Fri 18 Sep and covers all of aparāhṇa that afternoon.

ahargana.org/baoding/festivals/1925/mahalaya-amavasya · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 17 Sep
Ahargaṇa, classicalDisc centre, no refractionThu 17 Sep
compat-drikpanchangComparison profileThu 17 Sep
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 17thCoveredAparāhṇa 18thCoveredRuled
Los Angeles18:58 → 20:1213:01148 min13:010 min17 Sep
Chicago21:58 → 23:1213:59149 min13:590 min17 Sep
Jersey City22:58 → 00:1214:05149 min14:040 min17 Sep
Port of Spain22:58 → 00:1213:13146 min13:130 min17 Sep
London03:58 → 05:1214:10151 min14:090 min17 Sep
Durban04:58 → 06:1213:02143 min13:020 min17 Sep
Dubai06:58 → 08:1213:27147 min13:260 min17 Sep
Delhi08:28 → 09:4213:29148 min13:290 min17 Sep
Kolkata08:28 → 09:4212:45147 min12:440 min17 Sep
Singapore09:58 → 11:1213:12145 min13:120 min17 Sep
Sydney12:58 → 14:1213:02143 min13:0171 min17 Sep
Suva14:58 → 16:1213:1339 min13:13144 min18 Sep
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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