Ruling · Dattātreyotpatti (Datta Jayanti) · 2099

Sunday 27 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 121 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 26 December

Pūrṇimā is absent from pradoṣa. Not taken.

17:02 sunsetpradoṣa ends 18:59
16:3817:0217:2617:5018:1418:3819:0219:26

0 of 116 minutes covered

Evening of Sunday 27 December

Taken. The only evening Pūrṇimā reaches.

17:03 sunsetpradoṣa ends 18:59
16:3917:0317:2717:5118:1518:3919:0319:27

116 of 116 minutes covered

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

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 21:24 on Sat 26 Dec to 21:01 on Sun 27 Dec.

    2099-12-26T13:24:14Z → 2099-12-27T13:00:32Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 17:02–18:59 on the 26th, 17:03–18:59 on the 27th.

    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 26th and 116 of 116 on the 27th.

    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 7272 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2099: Sunday 27 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2099 falls on Sunday 27 December. Pūrṇimā runs from 21:24 on Sat 26 Dec to 21:01 on Sun 27 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/2099/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 27 Dec
Ahargaṇa, classicalDisc centre, no refractionSun 27 Dec
compat-drikpanchangComparison profileSun 27 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 26thCoveredSunset 27thCoveredRuled
Los Angeles05:24 → 05:0116:51113 min16:510 min26 Dec
Chicago07:24 → 07:0116:26119 min16:270 min26 Dec
Jersey City08:24 → 08:0116:35118 min16:360 min26 Dec
Port of Spain09:24 → 09:0117:52100 min17:530 min26 Dec
London13:24 → 13:0115:57129 min15:570 min26 Dec
Durban15:24 → 15:0118:5880 min18:590 min26 Dec
Dubai17:24 → 17:0117:37107 min17:380 min26 Dec
Delhi18:54 → 18:3117:3127 min17:3259 min27 Dec
Kolkata18:54 → 18:3117:000 min17:0090 min27 Dec
Singapore21:24 → 21:0119:070 min19:0796 min27 Dec
Sydney00:24 → 00:0120:080 min20:0877 min27 Dec
Suva01:24 → 01:0118:430 min18:4486 min27 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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