Ruling · Vasantotsava · 2093

Friday 13 March

Boundaryin Cairo, under the Rashtriya Panchang method. Pratipadā reaches sunrise on neither day and the rule does not say what then. Say “contested”.

Decide it for

30°04′ N 31°15′ E · Africa/Cairo · GeoNames 360630

The two sunrises

One ghaṭī is 24 minutes. The sunrise is read as upper limb, 31′ + 16′.

Sunrise of Friday 13 March

Taken. Pratipadā reaches neither sunrise; this is the day it falls on.

06:07 sunrise
Pratipadā begins 06:08:11
04:5505:1905:4306:0706:3106:5507:19

Absent at sunrise

Sunrise of Saturday 14 March

Pratipadā does not hold at sunrise. Not taken.

06:06 sunrise
Pratipadā ends 05:38:21
04:5405:1805:4206:0606:3006:5407:18

Absent at sunrise

Pratipadā presentSunrise, the instant the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Pratipadā runs from 06:08 on Fri 13 Mar to 05:38 on Sat 14 Mar.

    2093-03-13T04:08:12Z → 2093-03-14T03:38:22Z

  2. 02

    Kāla

    Sunrise is at 06:07 on the 13th and 06:06 on the 14th.

    sunrise: upper limb, 31′ + 16′

  3. 03

    Rule

    Pratipadā must be current at sunrise. It is not on the 13th and is not on the 14th.

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

  4. 04

    Tie-break

    Neither sunrise qualifies. The day the tithi falls on is taken.

    priority: purvaviddha → tithi-day · margin 66 s < 300 s

  5. 05

    Ruling

    Vasantotsava, Cairo, 2093: Friday 13 March.

    confidence: boundary (margin, absent-unstated)

Say it like this

In Cairo, Vasantotsava 2093 falls on Friday 13 March. Pratipadā runs from 06:08 on Fri 13 Mar to 05:38 on Sat 14 Mar, and is current at sunrise on neither day. It is 1 min 06 s from a threshold: treat the date as contested.

ahargana.org/cairo/festivals/2093/vasantotsava · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 13 Mar
Ahargaṇa, classicalDisc centre, no refractionFri 13 Mar
compat-drikpanchangComparison profileFri 13 Mar
No institution has a recorded ruling for Cairo.

Institutional rulings are recorded with a source address, and are never edited to agree.

The rule, as data

/rules/vasantotsava · ruleset 2026.3-draft

Month
Phālguna, amānta
Pakṣa · aṅga
Kṛṣṇa · Pratipadā
Kāla
Sunrise
Priority
Pūrvaviddhā
Tie-break
First day
Reference
CRC 1955, p. 105

“K 1 Vasantotsava (current at sunrise, if occurs on two successive days, it is to be observed on the first day).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlacePratipadāSunrise 13thCoveredSunrise 14thCoveredRuled
Los Angeles21:08 → 20:3807:05holds07:04no13 Mar
Chicago23:08 → 22:3807:05holds07:03no13 Mar
Jersey City00:08 → 23:3807:10holds07:09no13 Mar
Port of Spain00:08 → 23:3806:14holds06:14no13 Mar
London04:08 → 03:3806:18holds06:16no13 Mar
Durban06:08 → 05:3805:56no05:56no13 Mar
Dubai08:08 → 07:3806:30no06:29holds14 Mar
Delhi09:38 → 09:0806:33no06:32holds14 Mar
Kolkata09:38 → 09:0805:47no05:46holds14 Mar
Singapore12:08 → 11:3807:11no07:11holds14 Mar
Sydney15:08 → 14:3806:54no06:54holds14 Mar
Suva16:08 → 15:3806:09no06:09holds14 Mar
Profile · tradition
pac-rp@2026.1 · smarta
Rule
vasantotsava@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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