Ruling · Dattātreyotpatti (Dattātreya Jayantī) · 2001

Sunday 30 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 20 minutes.

Decide it for

BaodingDelhiKolkataSingaporeSydneyJersey City

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

The two evenings

One ghaṭī is 24 minutes. Pradoṣa is 2 muhūrtas after sunset.

Evening of Saturday 29 December

Pūrṇimā is absent from pradoṣa. Not taken.

17:04 sunsetpradoṣa ends 19:00
16:4017:0417:2817:5218:1618:4019:0419:28

0 of 116 minutes covered

Evening of Sunday 30 December

Taken. The only evening Pūrṇimā reaches.

17:05 sunsetpradoṣa ends 19:01
Pūrṇimā ends 18:40:32
16:4117:0517:2917:5318:1718:4119:0519:29

96 of 116 minutes covered, the first 96

Pūrṇimā presentPradoṣa, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 20:32 on Sat 29 Dec to 18:41 on Sun 30 Dec.

    2001-12-29T12:31:42Z → 2001-12-30T10:40:33Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 17:04–19:00 on the 29th, 17:05–19:01 on the 30th.

    pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Pūrṇimā must be present during pradoṣa. It covers 0 of 116 minutes on the 29th and 96 of 116 on the 30th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104

  4. 04

    Tie-break

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

    priority: unstated → only-day · margin 1224 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2001: Sunday 30 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2001 falls on Sunday 30 December. Pūrṇimā runs from 20:32 on Sat 29 Dec to 18:41 on Sun 30 Dec and covers 96 of 116 minutes of pradoṣa that evening.

ahargana.org/baoding/festivals/2001/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 30 Dec
Ahargaṇa, classicalDisc centre, no refractionSun 30 Dec
compat-drikpanchangComparison profileSun 30 Dec
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/dattatreyotpatti · ruleset 2026.3-draft

Month
Mārgaśīrṣa, amānta
Pakṣa · aṅga
Śukla · Pūrṇimā
Kāla
Pradoṣa
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 104

“S 15 Dattatreyotpatti (pradosa).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlacePūrṇimāSunset 29thCoveredSunset 30thCoveredRuled
Los Angeles04:32 → 02:4116:52113 min16:530 min29 Dec
Chicago06:32 → 04:4116:28119 min16:280 min29 Dec
Jersey City07:32 → 05:4116:37118 min16:380 min29 Dec
Port of Spain08:32 → 06:4117:53100 min17:540 min29 Dec
London12:32 → 10:4115:59129 min16:000 min29 Dec
Durban14:32 → 12:4118:5980 min18:590 min29 Dec
Dubai16:32 → 14:4117:38107 min17:390 min29 Dec
Delhi18:02 → 16:1117:3381 min17:340 min29 Dec
Kolkata18:02 → 16:1117:0146 min17:020 min29 Dec
Singapore20:32 → 18:4119:0812 min19:080 min29 Dec
Sydney23:32 → 21:4120:080 min20:0977 min30 Dec
Suva00:32 → 22:4118:440 min18:4586 min30 Dec
Profile · tradition
pac-rp@2026.1 · smarta
Rule
dattatreyotpatti@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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