Ruling · Mahāṣṭamī (Durgāṣṭamī) · 2080

Monday 21 October

Boundaryin Baoding, under the Rashtriya Panchang method. A threshold is only 4 min 42 s away. Say “contested”.

Decide it for

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

The two middays

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

Midday of Sunday 20 October

Qualifies with 5 of 48 minutes. Not taken.

madhyāhna begins 11:39  12:27 madhyāhna ends
Aṣṭamī begins 12:22:03
10:5111:1511:3912:0312:2712:5113:15

5 of 48 minutes covered, the last 5

Midday of Monday 21 October

Taken. Both middays qualify; the rule takes the second.

madhyāhna begins 11:39  12:27 madhyāhna ends
10:5111:1511:3912:0312:2712:5113:15

48 of 48 minutes covered

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

How it was decided

  1. 01

    Aṅga

    Aṣṭamī runs from 12:22 on Sun 20 Oct to 14:47 on Mon 21 Oct.

    2080-10-20T04:22:03Z → 2080-10-21T06:47:06Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:39–12:27 on the 20th, 11:39–12:27 on the 21st.

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

  3. 03

    Rule

    Aṣṭamī must be present during madhyāhna. It covers 5 of 48 minutes on the 20th and 48 of 48 on the 21st.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104

  4. 04

    Tie-break

    Both middays qualify. Paraviddhā: the second is taken.

    priority: paraviddha → paraviddha · margin 282 s < 300 s

  5. 05

    Ruling

    Mahāṣṭamī, Baoding, 2080: Monday 21 October.

    confidence: boundary (margin)

Say it like this

In Baoding, Mahāṣṭamī (Durga Ashtami) 2080 falls on Monday 21 October. Aṣṭamī runs from 12:22 on Sun 20 Oct to 14:47 on Mon 21 Oct and covers all of madhyāhna that midday. It also reaches the previous midday for 5 minutes; by the rule the second midday is taken. It is 4 min 42 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/2080/mahashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 21 Oct
Ahargaṇa, classicalDisc centre, no refractionMon 21 Oct
compat-drikpanchangComparison profileMon 21 Oct
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/mahashtami · ruleset 2026.3-draft

Month
Āśvina, amānta
Pakṣa · aṅga
Śukla · Aṣṭamī
Kāla
Madhyāhna
Priority
Paraviddhā
Tie-break
Second day
Reference
CRC 1955, p. 104

“S 8 Mahastami (paraviddha)” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceAṣṭamīMadhyāhna 20thCoveredMadhyāhna 21stCoveredRuled
Los Angeles21:22 → 23:4712:1448 min12:130 min20 Oct
Chicago23:22 → 01:4712:1148 min12:110 min20 Oct
Jersey City00:22 → 02:4712:1748 min12:170 min20 Oct
Port of Spain00:22 → 02:4711:2748 min11:270 min20 Oct
London05:22 → 07:4712:2148 min12:210 min20 Oct
Durban06:22 → 08:4711:1748 min11:170 min20 Oct
Dubai08:22 → 10:4711:3948 min11:390 min20 Oct
Delhi09:52 → 12:1711:4248 min11:4236 min21 Oct
Kolkata09:52 → 12:1710:5748 min10:5748 min21 Oct
Singapore12:22 → 14:4712:2548 min12:2548 min21 Oct
Sydney15:22 → 17:4712:160 min12:1648 min21 Oct
Suva16:22 → 18:4711:270 min11:2748 min21 Oct
Profile · tradition
pac-rp@2026.1 · smarta
Rule
mahashtami@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

About Ahargaṇa