Ruling · Rudra Vrata · 2021

Tuesday 7 September

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 180 minutes.

Decide it for

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

The two middays

One ghaṭī is 24 minutes. Madhyāhna is 1 ghaṭikā either side of midday.

Midday of Tuesday 7 September

Taken. The only midday Pratipadā reaches.

madhyāhna begins 11:52  12:40 madhyāhna ends
11:0411:2811:5212:1612:4013:0413:28

48 of 48 minutes covered

Midday of Wednesday 8 September

Pratipadā is absent from madhyāhna. Not taken.

madhyāhna begins 11:52  12:40 madhyāhna ends
11:0411:2811:5212:1612:4013:0413:28

0 of 48 minutes covered

Pratipadā presentMadhyāhna, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Pratipadā runs from 08:52 on Tue 7 Sep to 07:08 on Wed 8 Sep.

    2021-09-07T00:51:46Z → 2021-09-07T23:07:34Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:52–12:40 on the 7th, 11:52–12:40 on the 8th.

    madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Pratipadā must be present during madhyāhna. It covers 48 of 48 minutes on the 7th and 0 of 48 on the 8th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103

  4. 04

    Tie-break

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

    priority: purvaviddha → only-day · margin 10806 s

  5. 05

    Ruling

    Rudra Vrata, Baoding, 2021: Tuesday 7 September.

    confidence: determinate

Say it like this

In Baoding, Rudra Vrata 2021 falls on Tuesday 7 September. Pratipadā runs from 08:52 on Tue 7 Sep to 07:08 on Wed 8 Sep and covers all of madhyāhna that midday.

ahargana.org/baoding/festivals/2021/rudra-vrata · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 7 Sep
Ahargaṇa, classicalDisc centre, no refractionTue 7 Sep
compat-drikpanchangComparison profileTue 7 Sep
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/rudra-vrata · ruleset 2026.3-draft

Month
Bhādrapada, amānta
Pakṣa · aṅga
Śukla · Pratipadā
Kāla
Madhyāhna
Priority
Pūrvaviddhā
Tie-break
First day
Reference
CRC 1955, p. 103

“S 1 Rudra vrata (purvaviddha).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlacePratipadāMadhyāhna 7thCoveredMadhyāhna 8thCoveredRuled
Los Angeles17:52 → 16:0812:2748 min12:260 min7 Sep
Chicago19:52 → 18:0812:2448 min12:240 min7 Sep
Jersey City20:52 → 19:0812:3048 min12:290 min7 Sep
Port of Spain20:52 → 19:0811:4048 min11:400 min7 Sep
London01:52 → 00:0812:3448 min12:340 min7 Sep
Durban02:52 → 01:0811:3048 min11:300 min7 Sep
Dubai04:52 → 03:0811:5348 min11:520 min7 Sep
Delhi06:22 → 04:3811:5548 min11:550 min7 Sep
Kolkata06:22 → 04:3811:1048 min11:100 min7 Sep
Singapore08:52 → 07:0812:3948 min12:380 min7 Sep
Sydney10:52 → 09:0811:2948 min11:290 min7 Sep
Suva12:52 → 11:0811:410 min11:400 min8 Sep
Profile · tradition
pac-rp@2026.1 · smarta
Rule
rudra-vrata@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

About Ahargaṇa