Overview
- astronomical autumn starts today with the Sun positioned over the equator, whereas meteorological autumn has run since 1 September in the Northern Hemisphere.
- at the equinox the Northern and Southern Hemispheres receive roughly equal sunlight, bringing spring to the south as days shorten in the north.
- day and night are nearly, not exactly, equal because atmospheric refraction makes sunrise appear earlier and sunset later than the geometric times.
- the equinox carries cultural resonance in some countries, including Japan where Shūbun no Hi is observed with family visits and reflection.
- regional forecasters in Flevoland report a cool, mostly dry week near 18°C by day and 8–10°C at night, after a wetter‑than‑average September with around 95–102 mm recorded at local stations.