Ruling · Śaṅkara Jayantī · 2021

Sunday 16 May

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 122 minutes.

Decide it for

TehranDelhiKolkataSingaporeSydneyJersey City

35°42′ N 51°25′ E · Asia/Tehran · GeoNames 112931

The two middays

One ghaṭī is 24 minutes. Madhyāhna is 1 ghaṭikā either side of midday.

Midday of Sunday 16 May

Taken. The only midday Pañcamī reaches.

madhyāhna begins 12:37  13:25 madhyāhna ends
11:4912:1312:3713:0113:2513:4914:13

48 of 48 minutes covered

Midday of Monday 17 May

Pañcamī is absent from madhyāhna. Not taken.

madhyāhna begins 12:37  13:25 madhyāhna ends
11:4912:1312:3713:0113:2513:4914:13

0 of 48 minutes covered

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

How it was decided

  1. 01

    Aṅga

    Pañcamī runs from 09:02 on Sun 16 May to 10:35 on Mon 17 May.

    2021-05-16T04:31:31Z → 2021-05-17T06:05:04Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:37–13:25 on the 16th, 12:37–13:25 on the 17th.

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

  3. 03

    Rule

    Pañcamī must be present during madhyāhna. It covers 48 of 48 minutes on the 16th and 0 of 48 on the 17th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102

  4. 04

    Tie-break

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

    priority: unstated → only-day · margin 7313 s

  5. 05

    Ruling

    Śaṅkara Jayantī, Tehran, 2021: Sunday 16 May.

    confidence: determinate

Say it like this

In Tehran, Śaṅkara Jayantī 2021 falls on Sunday 16 May. Pañcamī runs from 09:02 on Sun 16 May to 10:35 on Mon 17 May and covers all of madhyāhna that midday.

ahargana.org/tehran/festivals/2021/shankara-jayanti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 16 May
Ahargaṇa, classicalDisc centre, no refractionSun 16 May
compat-drikpanchangComparison profileSun 16 May
No institution has a recorded ruling for Tehran.

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

The rule, as data

/rules/shankara-jayanti · ruleset 2026.3-draft

Month
Vaiśākha, amānta
Pakṣa · aṅga
Śukla · Pañcamī
Kāla
Madhyāhna
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 102

“S 5 Sankara jayanti.” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlacePañcamīMadhyāhna 16thCoveredMadhyāhna 17thCoveredRuled
Los Angeles21:32 → 23:0512:2648 min12:260 min16 May
Chicago23:32 → 01:0512:2348 min12:230 min16 May
Jersey City00:32 → 02:0512:2948 min12:290 min16 May
Port of Spain00:32 → 02:0511:3948 min11:390 min16 May
London05:32 → 07:0512:3348 min12:330 min16 May
Durban06:32 → 08:0511:2848 min11:280 min16 May
Dubai08:32 → 10:0511:5148 min11:510 min16 May
Delhi10:02 → 11:3511:5448 min11:540 min16 May
Kolkata10:02 → 11:3511:0948 min11:0926 min16 May
Singapore12:32 → 14:0512:3748 min12:3748 min16 May
Sydney14:32 → 16:0511:270 min11:2748 min17 May
Suva16:32 → 18:0511:390 min11:3948 min17 May
Profile · tradition
pac-rp@2026.1 · smarta
Rule
shankara-jayanti@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

About Ahargaṇa