Ruling · Ratha Saptamī · 1920

Wednesday 28 January

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 294 minutes.

Decide it for

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

The two dawns

One ghaṭī is 24 minutes. Aruṇodaya is 2 muhūrtas before sunrise.

Dawn of Tuesday 27 January

Saptamī is absent from aruṇodaya. Not taken.

05:38 aruṇodaya beginssunrise 07:30
05:1405:3806:0206:2606:5007:1407:3808:02

0 of 112 minutes covered

Dawn of Wednesday 28 January

Taken. The only dawn Saptamī reaches.

05:38 aruṇodaya beginssunrise 07:30
05:1405:3806:0206:2606:5007:1407:3808:02

112 of 112 minutes covered

Saptamī presentAruṇodaya, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Saptamī runs from 13:40 on Tue 27 Jan to 12:24 on Wed 28 Jan.

    1920-01-27T05:39:47Z → 1920-01-28T04:23:51Z

  2. 02

    Kāla

    Aruṇodaya is 2 muhūrtas before sunrise: 05:38–07:30 on the 27th, 05:38–07:30 on the 28th.

    arunodaya: prev-night-muhurta-14-15 · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Saptamī must be present during aruṇodaya. It covers 0 of 112 minutes on the 27th and 112 of 112 on the 28th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105

  4. 04

    Tie-break

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

    priority: unstated → only-day · margin 17661 s

  5. 05

    Ruling

    Ratha Saptamī, Baoding, 1920: Wednesday 28 January.

    confidence: determinate

Say it like this

In Baoding, Ratha Saptamī 1920 falls on Wednesday 28 January. Saptamī runs from 13:40 on Tue 27 Jan to 12:24 on Wed 28 Jan and covers all of aruṇodaya that dawn.

ahargana.org/baoding/festivals/1920/ratha-saptami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 28 Jan
Ahargaṇa, classicalDisc centre, no refractionWed 28 Jan
compat-drikpanchangComparison profileWed 28 Jan
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/ratha-saptami · ruleset 2026.3-draft

Month
Māgha, amānta
Pakṣa · aṅga
Śukla · Saptamī
Kāla
Aruṇodaya
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 105

“S 7 Ratha saptami (covering 4 ghatikas before sunrise), Acala saptami, Vidhana saptami, Arogya saptami [purvaviddha].” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceSaptamīAruṇodaya 27thCoveredAruṇodaya 28thCoveredRuled
Los Angeles21:40 → 20:2405:05109 min05:050 min27 Jan
Chicago23:40 → 22:2405:16114 min05:150 min27 Jan
Jersey City00:40 → 23:2405:19113 min05:190 min27 Jan
Port of Spain01:40 → 00:2404:5199 min04:510 min27 Jan
London05:40 → 04:2405:47122 min05:460 min27 Jan
Durban07:40 → 06:2403:570 min03:5783 min28 Jan
Dubai09:40 → 08:2405:200 min05:19105 min28 Jan
Delhi11:10 → 09:5405:260 min05:26106 min28 Jan
Kolkata11:10 → 09:5404:340 min04:34104 min28 Jan
Singapore12:40 → 11:2404:400 min04:4096 min28 Jan
Sydney15:40 → 14:2403:500 min03:5181 min28 Jan
Suva17:40 → 16:2404:210 min04:2288 min28 Jan
Profile · tradition
pac-rp@2026.1 · smarta
Rule
ratha-saptami@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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