BREAKING NEWS: First Day of Autumn

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First Day of Autumn 2026

Astronomical Autumn

  • Date: September 22, 2026
  • Time: 8:05 p.m. EDT (5:05 p.m. PDT, 00:05 UTC on September 23)
  • Significance: This date marks the autumnal equinox, when day and night are approximately equal in length.

Meteorological Autumn

  • Start Date: September 1, 2026
  • Duration: September, October, and November
  • Purpose: This definition divides the year into four seasons of three months each, making it easier for meteorologists to track climate patterns.

Summary of Definitions

DefinitionStart DateDuration
AstronomicalSeptember 22Until Winter Solstice (Dec 21)
MeteorologicalSeptember 1September to November

Both definitions are correct but serve different purposes. Astronomical autumn is based on the position of the Earth relative to the Sun, while meteorological autumn is based on calendar months.

COMMENTS APPRECIATED

EDUCATION: Books

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