Astronomical Autumn Begins 23 September 2026
Astronomical autumn begins on September 23, 2026, at 03:05 MSK, when the Sun crosses the celestial equator and moves from the Northern to the Southern celestial hemisphere, marking the start of longer nights in the Northern Hemisphere.
Consensus
- Astronomical autumn begins on 23 September 2026.
- The Sun crosses the celestial equator at 03:05 MSK on 23 September.
- The Sun moves from the Northern to the Southern celestial hemisphere.
- After this event, nights become longer than days in the Northern Hemisphere.
- In the Southern Hemisphere, nights become shorter, marking the start of astronomical spring.
- The Sun moves from the constellation Leo to Virgo by 16 September.
- Daylight duration in Moscow decreases from 13 hours 52 minutes to 11 hours 40 minutes in September.
- The solar altitude at noon in Moscow decreases from 41–42 degrees to 31 degrees in September.
Points of divergence
- Baboe leto may arrive in Moscow in mid-September, caused by a stable Azores anticyclone ridge. — vm
- Prolonged nostalgia for the departing summer lasting over two weeks may indicate depression. — vm
- The lunar eclipse on 28 August lasted over five and a half hours and turned the Moon blood-red. — vesti
- The next red Moon will be visible in Russia on New Year's Eve 2028. — vesti
- Rainstorms are likely to affect Moscow and Central Russia in September. — m24
- A typical summer-like warm spell may not occur at the beginning of autumn. — m24
Coverage (5 sources)
- Astronomical autumn will begin at 03:05 on September 23, said the capital planetarium. — Первый Московский
- When will astronomical autumn in Russia occur in 2026 — Вечерняя Москва
- Astronomical autumn will begin in Russia at 03:05 Moscow time on September 23. At this time the Sun will cross the celestial equator and move... — ТАСС (Telegram)
- In Russia, the date of the astronomical autumn meeting was named — Вести
- Astronomical autumn will arrive in Russia on September 23 — Москва 24
Key entities
- Russia
- Southern
- Northern Hemisphere
- TASS
- Sun
- Moscow Planetarium
- Moscow
- Northern Hemisphere
- Zemlya
- Nikita Simonov