Ruling · Vasantotsava · 1965

Thursday 18 March

Determinatein Chattogram, under the Rashtriya Panchang method. Clear of every threshold by 569 minutes.

Decide it for

22°20′ N 91°50′ E · Asia/Dhaka · GeoNames 1205733

The two sunrises

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

Sunrise of Wednesday 17 March

Pratipadā does not hold at sunrise. Not taken.

06:00 sunrise
04:4805:1205:3606:0006:2406:4807:12

Absent at sunrise

Sunrise of Thursday 18 March

Taken. The only sunrise Pratipadā holds at.

05:59 sunrise
04:4705:1105:3505:5906:2306:4707:11

Holds 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 17:24 on Wed 17 Mar to 15:29 on Thu 18 Mar.

    1965-03-17T11:23:48Z → 1965-03-18T09:28:33Z

  2. 02

    Kāla

    Sunrise is at 06:00 on the 17th and 05:59 on the 18th.

    sunrise: upper limb, 31′ + 16′

  3. 03

    Rule

    Pratipadā must be current at sunrise. It is not on the 17th and is on the 18th.

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

  4. 04

    Tie-break

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

    priority: purvaviddha → only-day · margin 34147 s

  5. 05

    Ruling

    Vasantotsava, Chattogram, 1965: Thursday 18 March.

    confidence: determinate

Say it like this

In Chattogram, Vasantotsava 1965 falls on Thursday 18 March. Pratipadā runs from 17:24 on Wed 17 Mar to 15:29 on Thu 18 Mar and is current at sunrise that day.

ahargana.org/chattogram/festivals/1965/vasantotsava · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 18 Mar
Ahargaṇa, classicalDisc centre, no refractionThu 18 Mar
compat-drikpanchangComparison profileThu 18 Mar
No institution has a recorded ruling for Chattogram.

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 17thCoveredSunrise 18thCoveredRuled
Los Angeles03:24 → 01:2906:01holds06:00no17 Mar
Chicago05:24 → 03:2906:00holds05:58no17 Mar
Jersey City06:24 → 04:2906:05no06:04no17 Mar
Port of Spain07:24 → 05:2906:12no06:12no17 Mar
London11:24 → 09:2906:11no06:09holds18 Mar
Durban13:24 → 11:2905:57no05:58holds18 Mar
Dubai15:24 → 13:2906:27no06:26holds18 Mar
Delhi16:54 → 14:5906:29no06:28holds18 Mar
Kolkata16:54 → 14:5905:44no05:43holds18 Mar
Singapore18:54 → 16:5906:40no06:40holds18 Mar
Sydney21:24 → 19:2905:56no05:57holds18 Mar
Suva23:24 → 21:2906:10no06:10holds18 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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