Ruling · Mattu Pongal · 1997

Wednesday 15 January

Determinatein Baoding, under the Rashtriya Panchang method. Kept the day after Pongal, Tue 14 Jan. Clear of every threshold by 621 minutes.

Decide it for

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

The two days

A tick is five ghaṭīs, two hours. The day is counted from the sunset before it to its own sunset.

Day of Tuesday 14 January

Taken for Pongal. The transit falls in this day. Mattu Pongal is the day after.

17:18 sunset beforesunset 17:19
Sun enters Makara 06:57:30
16:5420:5400:5404:5408:5412:5416:54

Falls in this day

Day of Wednesday 15 January

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

17:19 sunset beforesunset 17:20
16:5520:5500:5504:5508:5512:5516:55

Does not fall in this day

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

How it was decided

  1. 01

    Aṅga

    The Sun enters Makara at 06:58 on Tue 14 Jan.

    1997-01-13T22:57:31Z · nirayana, lahiri-iae1985

  2. 02

    Kāla

    The day is counted from the sunset before it to its own sunset: the day of the 14th ends at 17:19, and the day of the 15th ends at 17:20.

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

  3. 03

    Rule

    The festival is kept on the day of the transit, the day counted from the sunset before it: a transit after sunset belongs to the next day. The transit falls between the sunsets of the 13th and 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 sunset → only-day · margin 37268 s

  5. 05

    Counted

    Mattu Pongal is kept the day after Pongal: Tuesday 14 January is the day taken above.

    follows: pongal + 1 d

  6. 06

    Ruling

    Mattu Pongal, Baoding, 1997: Wednesday 15 January.

    confidence: determinate

Say it like this

In Baoding, Mattu Pongal 1997 falls on Wednesday 15 January. It is kept the day after Pongal, which falls on Tuesday 14 January. The Sun enters Makara at 06:58 on Tue 14 Jan. The rule counts the day from sunset to sunset, and the transit falls between the sunsets of the 13th and the 14th. Counted from sunrise, as in Orissa, it is 14 January.

ahargana.org/baoding/festivals/1997/mattu-pongal · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 15 Jan
Ahargaṇa, classicalDisc centre, no refractionWed 15 Jan
compat-drikpanchangComparison profileWed 15 Jan
Counted from midnightCRC 1955, p. 106Wed 15 Jan
Counted from sunrise (the Orissa rule)CRC 1955, p. 244Tue 14 Jan
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/mattu-pongal · ruleset 2026.3-draft

Sign entered
Makara
Zodiac
Nirayana
Ayanāṃśa
lahiri-iae1985
Day counted from
Sunset
Tie-break
None: an instant
Kept
The day after Pongal

“Makaradi — Makaradi snana, Magh Bihu (Assam), Tila samkranti, Pongal (S. India), Bhogi (S. India — on the day before Pongal), Mattu Pongal (S. India — on the day after Pongal).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 106. “The Tamil rule: In the Tamil districts the rule is that when a samkranti takes place before sunset, the month begins on the same day, while if it takes place after sunset the month begins on the following day.” Calendar Reform Committee 1955, Rules of Samkranti, p. 244.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceSun enters MakaraSunset before 13thCoveredSunset before 14thCoveredRuled
Los Angeles14:5817:04falls17:05no14 Jan
Chicago16:5816:41no16:42falls15 Jan
Jersey City17:5816:50no16:51falls15 Jan
Port of Spain18:5818:01no18:02falls15 Jan
London22:5816:16no16:17falls15 Jan
Durban00:5819:01no19:01falls15 Jan
Dubai02:5817:48no17:49falls15 Jan
Delhi04:2817:43no17:44falls15 Jan
Kolkata04:2817:11no17:11falls15 Jan
Singapore06:5819:14no19:15falls15 Jan
Sydney09:5820:09no20:09falls15 Jan
Suva10:5818:48no18:48falls15 Jan
Profile · tradition
pac-rp@2026.1 · smarta
Rule
mattu-pongal@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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