Ruling · Vaiśākhī (Baisakhi) · 2004

Tuesday 13 April

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 503 minutes.

Decide it for

46°35′ N 125°00′ E · Asia/Shanghai · GeoNames 2037860

The two days

A tick is five ghaṭīs, two hours. The day is sunrise to the next sunrise.

Day of Tuesday 13 April

Taken. The transit falls in this day.

04:57 sunrisenext sunrise 04:55
Sun enters Meṣa 20:32:19
04:3308:3312:3316:3320:3300:3304:33

Falls in this day

Day of Wednesday 14 April

The transit does not fall in this day. Not taken.

04:55 sunrisenext sunrise 04:53
04:3108:3112:3116:3120:3100:3104:31

Does not fall in this day

The day, the window the rule readsThe instant the Sun enters Meṣa

How it was decided

  1. 01

    Aṅga

    The Sun enters Meṣa at 20:32 on Tue 13 Apr.

    2004-04-13T12:32:19Z · nirayana, lahiri-iae1985

  2. 02

    Kāla

    The day runs from sunrise to the next sunrise: from 04:57 on the 13th, and from 04:55 on the 14th.

    day: sunrise-to-sunrise · sunrise: upper limb, 31′ + 16′

  3. 03

    Rule

    The festival is kept on the day of the transit, the day counted from sunrise. The transit falls on the 13th, not the 14th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 106

  4. 04

    Tie-break

    An instant falls in one day and no other. No tie-break is needed.

    day counted from sunrise → only-day · margin 30180 s

  5. 05

    Ruling

    Vaiśākhī, Daqing, 2004: Tuesday 13 April.

    confidence: determinate

Say it like this

In Daqing, Vaiśākhī (Baisakhi) 2004 falls on Tuesday 13 April. The Sun enters Meṣa at 20:32 on Tue 13 Apr, and the rule counts the day from sunrise. By the Tamil rule for the first day of a solar month, which gives a transit after sunset to the next day, it is 14 April.

ahargana.org/daqing/festivals/2004/vaishakhi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 13 Apr
Ahargaṇa, classicalDisc centre, no refractionTue 13 Apr
compat-drikpanchangComparison profileTue 13 Apr
Counted from midnightCRC 1955, p. 106Tue 13 Apr
Past sunset, the next day (the Tamil rule)CRC 1955, p. 244Wed 14 Apr
No institution has a recorded ruling for Daqing.

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

The rule, as data

/rules/vaishakhi · ruleset 2026.3-draft

Sign entered
Meṣa
Zodiac
Nirayana
Ayanāṃśa
lahiri-iae1985
Day counted from
Sunrise
Tie-break
None: an instant
Reference
CRC 1955, p. 106

“Mesadi — Cadaka puja (Bengal), Bahag Bihu (Assam), Cheiraoba (Manipur), Visu (T. C. State), Vaisakhi (on the samkramana day commencing from sunrise).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 106. “The following festivals are observed according to the day of Sun's transit into rasis (Ravi-samkramana). For this purpose the day has been taken to begin from midnight, i.e., when the samkramana takes place after midnight, the festival relating to the samkramana is to be observed on the following day.” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 106. The other names in the row (Cadaka puja, Bahag Bihu, Cheiraoba, Visu) are regional observances and wait with the regional rows.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceSun enters MeṣaSunrise 13thCoveredSunrise 14thCoveredRuled
Los Angeles05:3206:24no06:23no12 Apr
Chicago07:3206:13falls06:12no13 Apr
Jersey City08:3206:20falls06:19no13 Apr
Port of Spain08:3205:56falls05:56no13 Apr
London13:3206:09falls06:07no13 Apr
Durban14:3206:14falls06:15no13 Apr
Dubai16:3205:59falls05:58no13 Apr
Delhi18:0205:58falls05:57no13 Apr
Kolkata18:0205:18falls05:18no13 Apr
Singapore20:3207:01falls07:01no13 Apr
Sydney22:3206:16falls06:17no13 Apr
Suva00:3206:15falls06:16no13 Apr
Profile · tradition
pac-rp@2026.1 · smarta
Rule
vaishakhi@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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