Ruling · Ṛṣi Tarpaṇa · 1921

Thursday 18 August

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 498 minutes.

Decide it for

BaodingDelhiKolkataSingaporeSydneyJersey City

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 Wednesday 17 August

Pūrṇimā is absent from madhyāhna. Not taken.

madhyāhna begins 11:58  12:46 madhyāhna ends
11:1011:3411:5812:2212:4613:1013:34

0 of 48 minutes covered

Midday of Thursday 18 August

Taken. The only midday Pūrṇimā reaches.

madhyāhna begins 11:58  12:46 madhyāhna ends
11:1011:3411:5812:2212:4613:1013:34

48 of 48 minutes covered

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

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 21:04 on Wed 17 Aug to 23:28 on Thu 18 Aug.

    1921-08-17T13:03:48Z → 1921-08-18T15:27:59Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:58–12:46 on the 17th, 11:58–12:46 on the 18th.

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

  3. 03

    Rule

    Pūrṇimā must be present during madhyāhna. It covers 0 of 48 minutes on the 17th and 48 of 48 on the 18th.

    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: unstated → only-day · margin 29873 s

  5. 05

    Ruling

    Ṛṣi Tarpaṇa, Baoding, 1921: Thursday 18 August.

    confidence: determinate

Say it like this

In Baoding, Ṛṣi Tarpaṇa 1921 falls on Thursday 18 August. Pūrṇimā runs from 21:04 on Wed 17 Aug to 23:28 on Thu 18 Aug and covers all of madhyāhna that midday.

ahargana.org/baoding/festivals/1921/rishi-tarpana · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 18 Aug
Ahargaṇa, classicalDisc centre, no refractionThu 18 Aug
compat-drikpanchangComparison profileThu 18 Aug
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/rishi-tarpana · ruleset 2026.3-draft

Month
Śrāvaṇa, amānta
Pakṣa · aṅga
Śukla · Pūrṇimā
Kāla
Madhyāhna
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 103

“S 15 Rakhi purnima, Naroli purnima (Cocoanut day), Raksa Bandhana (in the second half of purnima), Rsi tarpana (madhyahna vyapini), Hayagriva utpatti, Jhulanayatra samapana” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlacePūrṇimāMadhyāhna 17thCoveredMadhyāhna 18thCoveredRuled
Los Angeles05:04 → 07:2811:3348 min11:320 min17 Aug
Chicago08:04 → 10:2812:3048 min12:300 min17 Aug
Jersey City09:04 → 11:2812:3648 min12:360 min17 Aug
Port of Spain09:04 → 11:2811:4648 min11:460 min17 Aug
London14:04 → 16:2812:400 min12:4048 min18 Aug
Durban15:04 → 17:2811:360 min11:3648 min18 Aug
Dubai17:04 → 19:2811:590 min11:5848 min18 Aug
Delhi18:34 → 20:5812:010 min12:0148 min18 Aug
Kolkata18:34 → 20:5811:160 min11:1648 min18 Aug
Singapore20:04 → 22:2811:450 min11:4448 min18 Aug
Sydney23:04 → 01:2811:350 min11:3548 min18 Aug
Suva01:04 → 03:2811:470 min11:4648 min18 Aug
Profile · tradition
pac-rp@2026.1 · smarta
Rule
rishi-tarpana@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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