Ruling · Ratha Saptamī · 2099

Thursday 29 January

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 45 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 Wednesday 28 January

Saptamī is absent from aruṇodaya. Not taken.

05:37 aruṇodaya beginssunrise 07:28
05:1305:3706:0106:2506:4907:1307:3708:01

0 of 111 minutes covered

Dawn of Thursday 29 January

Taken. The only dawn Saptamī reaches.

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

111 of 111 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 08:14 on Wed 28 Jan to 10:02 on Thu 29 Jan.

    2099-01-28T00:13:42Z → 2099-01-29T02:02:10Z

  2. 02

    Kāla

    Aruṇodaya is 2 muhūrtas before sunrise: 05:37–07:28 on the 28th, 05:36–07:27 on the 29th.

    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 111 minutes on the 28th and 111 of 111 on the 29th.

    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 2727 s

  5. 05

    Ruling

    Ratha Saptamī, Baoding, 2099: Thursday 29 January.

    confidence: determinate

Say it like this

In Baoding, Ratha Saptamī 2099 falls on Thursday 29 January. Saptamī runs from 08:14 on Wed 28 Jan to 10:02 on Thu 29 Jan and covers all of aruṇodaya that dawn.

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

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 29 Jan
Ahargaṇa, classicalDisc centre, no refractionThu 29 Jan
compat-drikpanchangComparison profileThu 29 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 28thCoveredAruṇodaya 29thCoveredRuled
Los Angeles16:14 → 18:0205:04109 min05:040 min28 Jan
Chicago18:14 → 20:0205:14113 min05:130 min28 Jan
Jersey City19:14 → 21:0205:18112 min05:170 min28 Jan
Port of Spain20:14 → 22:0204:5199 min04:510 min28 Jan
London00:14 → 02:0205:44120 min05:430 min28 Jan
Durban02:14 → 04:0203:5883 min03:593 min28 Jan
Dubai04:14 → 06:0205:19104 min05:1943 min28 Jan
Delhi05:44 → 07:3205:2688 min05:25106 min29 Jan
Kolkata05:44 → 07:3204:3434 min04:34103 min29 Jan
Singapore08:14 → 10:0205:410 min05:4196 min29 Jan
Sydney11:14 → 13:0204:520 min04:5381 min29 Jan
Suva12:14 → 14:0204:230 min04:2389 min29 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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