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From the “Sky” package

September Equinox

The moment day and night become equal in length; the astronomical start of autumn

Historical confidence: Attested

In nearby years

1403 Sunday 1 Mehr 1403 22 September 2024
1404 Monday 31 Shahrivar 1404 22 September 2025
1405 Wednesday 1 Mehr 1405 23 September 2026
1406 Thursday 1 Mehr 1406 23 September 2027
1407 Friday 1 Mehr 1407 22 September 2028

Rule: Based on the September equinox
Tags: #astronomy
Sources: Astronomical Engine
Official status: Not an official holiday anywhere.
Version: Sky 3.0.0 · CC-BY-4.0

Other occasions in this package

Vernal Equinox
June Solstice
December Solstice
New Moon
Full Moon
Moon in Scorpio
Quadrantids Meteor Shower
Lyrids Meteor Shower

The Persian calendar that reckons from the sky

Reckoned by the Zij engine 1.1.1 on the 52.5° E meridian

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Zij, the Persian calendar. Open source.