Ruling · Ratha Saptamī · 1906

Wednesday 31 January

Boundaryin Baoding, under the Rashtriya Panchang method. Both dawns qualify and the rule does not say which to take. Say “contested”.

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 Wednesday 31 January

Taken. Both dawns qualify; the rule is silent, and this one is covered longer.

05:36 aruṇodaya beginssunrise 07:27
05:1205:3606:0006:2406:4807:1207:3608:00

111 of 111 minutes covered

Dawn of Thursday 1 February

Qualifies with 99 of 111 minutes. Not taken.

05:35 aruṇodaya beginssunrise 07:26
Saptamī ends 07:14:52
05:1105:3505:5906:2306:4707:1107:3507:59

99 of 111 minutes covered, the first 99

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

How it was decided

  1. 01

    Aṅga

    Saptamī runs from 04:50 on Wed 31 Jan to 07:15 on Thu 1 Feb.

    1906-01-30T20:49:40Z → 1906-01-31T23:14:52Z

  2. 02

    Kāla

    Aruṇodaya is 2 muhūrtas before sunrise: 05:36–07:27 on the 31st, 05:35–07:26 on the 1st.

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

  3. 03

    Rule

    Saptamī must be present during aruṇodaya. It covers 111 of 111 minutes on the 31st and 99 of 111 on the 1st.

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

  4. 04

    Tie-break

    Both dawns qualify and the rule marks neither. The one covered longer is ruled, as a boundary.

    priority: unstated → greater-coverage · margin 670 s

  5. 05

    Ruling

    Ratha Saptamī, Baoding, 1906: Wednesday 31 January.

    confidence: boundary (tie-break-unstated)

Say it like this

In Baoding, Ratha Saptamī 1906 falls on Wednesday 31 January. Saptamī runs from 04:50 on Wed 31 Jan to 07:15 on Thu 1 Feb and covers all of aruṇodaya that dawn. It also reaches the next dawn for 99 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested.

ahargana.org/baoding/festivals/1906/ratha-saptami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 31 Jan
Ahargaṇa, classicalDisc centre, no refractionWed 31 Jan
compat-drikpanchangComparison profileWed 31 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 30thCoveredAruṇodaya 31stCoveredRuled
Los Angeles12:50 → 15:1505:040 min05:04108 min31 Jan
Chicago14:50 → 17:1505:140 min05:13112 min31 Jan
Jersey City15:50 → 18:1505:170 min05:17112 min31 Jan
Port of Spain16:50 → 19:1504:510 min04:5199 min31 Jan
London20:50 → 23:1505:440 min05:43120 min31 Jan
Durban22:50 → 01:1503:590 min04:0084 min31 Jan
Dubai00:31 → 02:5605:000 min05:00104 min31 Jan
Delhi02:20 → 04:4505:250 min05:25106 min31 Jan
Kolkata02:20 → 04:4504:340 min04:34103 min31 Jan
Singapore03:50 → 06:1504:410 min04:4196 min31 Jan
Sydney06:50 → 09:1503:530 min03:530 min1 Feb
Suva08:45 → 11:1004:180 min04:190 min1 Feb
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

About Ahargaṇa