Ruling · Dattātreyotpatti (Datta Jayanti) · 2075

Saturday 21 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 11 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 21 December

Taken. The only evening Pūrṇimā reaches.

16:59 sunsetpradoṣa ends 18:56
16:3516:5917:2317:4718:1118:3518:5919:23

117 of 117 minutes covered

Evening of Sunday 22 December

Pūrṇimā is absent from pradoṣa. Not taken.

17:00 sunsetpradoṣa ends 18:56
Pūrṇimā ends 16:48:50
16:3617:0017:2417:4818:1218:3619:0019:24

0 of 117 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 14:33 on Sat 21 Dec to 16:49 on Sun 22 Dec.

    2075-12-21T06:33:28Z → 2075-12-22T08:48:50Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:59–18:56 on the 21st, 17:00–18:56 on the 22nd.

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

  3. 03

    Rule

    Pūrṇimā must be present during pradoṣa. It covers 117 of 117 minutes on the 21st and 0 of 117 on the 22nd.

    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 649 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2075: Saturday 21 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2075 falls on Saturday 21 December. Pūrṇimā runs from 14:33 on Sat 21 Dec to 16:49 on Sun 22 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/2075/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 21 Dec
Ahargaṇa, classicalDisc centre, no refractionSat 21 Dec
compat-drikpanchangComparison profileSat 21 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 21stCoveredSunset 22ndCoveredRuled
Los Angeles22:33 → 00:4916:48113 min16:480 min21 Dec
Chicago00:33 → 02:4916:23119 min16:230 min21 Dec
Jersey City01:33 → 03:4916:32118 min16:320 min21 Dec
Port of Spain02:33 → 04:4917:49100 min17:500 min21 Dec
London06:33 → 08:4915:53130 min15:540 min21 Dec
Durban08:33 → 10:4918:5680 min18:560 min21 Dec
Dubai10:33 → 12:4917:34107 min17:350 min21 Dec
Delhi12:03 → 14:1917:28110 min17:290 min21 Dec
Kolkata12:03 → 14:1916:57106 min16:570 min21 Dec
Singapore14:33 → 16:4919:0496 min19:040 min21 Dec
Sydney17:33 → 19:4920:0577 min20:060 min21 Dec
Suva18:33 → 20:4918:4186 min18:4186 min22 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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