Ruling · Dattātreyotpatti (Datta Jayanti) · 1983

Monday 19 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 299 minutes.

Decide it for

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 Monday 19 December

Taken. The only evening Pūrṇimā reaches.

16:58 sunsetpradoṣa ends 18:55
16:3416:5817:2217:4618:1018:3418:5819:22

117 of 117 minutes covered

Evening of Tuesday 20 December

Pūrṇimā is absent from pradoṣa. Not taken.

16:58 sunsetpradoṣa ends 18:55
16:3416:5817:2217:4618:1018:3418:5819:22

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 11:59 on Mon 19 Dec to 10:00 on Tue 20 Dec.

    1983-12-19T03:59:02Z → 1983-12-20T02:00:16Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:58–18:55 on the 19th, 16:58–18:55 on the 20th.

    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 19th and 0 of 117 on the 20th.

    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 17934 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 1983: Monday 19 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1983 falls on Monday 19 December. Pūrṇimā runs from 11:59 on Mon 19 Dec to 10:00 on Tue 20 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1983/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 19 Dec
Ahargaṇa, classicalDisc centre, no refractionMon 19 Dec
compat-drikpanchangComparison profileMon 19 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 19thCoveredSunset 20thCoveredRuled
Los Angeles19:59 → 18:0016:4674 min16:470 min19 Dec
Chicago21:59 → 20:0016:21119 min16:220 min19 Dec
Jersey City22:59 → 21:0016:31118 min16:310 min19 Dec
Port of Spain23:59 → 22:0017:48100 min17:480 min19 Dec
London03:59 → 02:0015:52130 min15:520 min19 Dec
Durban05:59 → 04:0018:5480 min18:550 min19 Dec
Dubai07:59 → 06:0017:33107 min17:330 min19 Dec
Delhi09:29 → 07:3017:27110 min17:280 min19 Dec
Kolkata09:29 → 07:3016:56106 min16:560 min19 Dec
Singapore11:59 → 10:0019:0396 min19:030 min19 Dec
Sydney14:59 → 13:0020:0477 min20:040 min19 Dec
Suva15:59 → 14:0018:3986 min18:400 min19 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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