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Sankashti Chaturthi in May 2027

The Saṅkaṣṭī Caturthī of May 2027: the day kept, its moonrise, and the Chaturthī across the evenings, for your city’s moonrise.

Sankashti in Delhi

  • Vaishakha / JyeshthaSunday, 23 May, moonrise 21:59

Sunday, 23 May

Vaishakha (amanta) / Jyeshtha (purnimanta), Krishna Chaturthi

Chaturthi from Sun 23 May, 20:42 to Mon 24 May, 22:59, Delhi time.

Kept on Sunday, 23 May: the Chaturthī is current at the moonrise on both Sunday and Monday, so some keep the earlier day, Sunday, joined with Tṛtīyā, and others the later, Monday, 24 May. Nirṇaya-sindhu p. 47

Questions

Rules from the Nirṇaya-sindhu and the Vīramitrodaya, with the page for each.

When is Sankashti Chaturthi in May 2027?

In Delhi: Sunday, 23 May, moonrise at 21:59.

What is Sankashti Chaturthi?

A vow to Gaṇeśa on the Chaturthī, the fourth tithi, of the dark half of the lunar month, kept on the day the Chaturthī is current at moonrise. The dark half is common practice; the texts read do not state the fortnight. Nirṇaya-sindhu p. 47; Vīramitrodaya p. 38

Why does the date differ between cities?

Each date is worked out for the city’s own moonrise. The Chaturthī begins and ends at the same moment everywhere, but whether it is current at a city’s moonrise depends on the city, so cities far apart can keep different days.

What is Sankatahara Chaturthi?

Saṅkaṭahara Caturthī is the South Indian name for the same vow, and the dates here apply to it.

What is Angaraki Sankashti?

A Saṅkaṣṭī Caturthī that falls on a Tuesday. Śātātapa says a Caturthī on a Tuesday “gives fruit like the equinox”. The name Aṅgārakī is popular; the texts read do not use it. Nirṇaya-sindhu p. 73

How the days are found

Read the methodology
The day kept
The dark-fortnight Chaturthī current at moonrise. When it is current at both moonrises, the earlier day, joined with Tṛtīyā, is kept, with the later day noted, and at neither, the later day.
Moonrise
The visible rise: the Moon’s upper limb, with refraction, for the chosen city. The texts do not say; this is our convention.
The fortnight
Krishna paksha, by common practice. The texts read do not state the fortnight.
Sources
Nirṇaya-sindhu, 1898, pp. 47, 73; Vīramitrodaya, Samaya-prakāśa, p. 38.

Moonrise of the Moon’s upper limb, with refraction · Lahiri ayanamsa for month names · each city’s own time · Swiss Ephemeris · Method