This year's autumnal equinox takes place on Sept. 22, but what does that mean? Here's what you need to know. ... <看更多>

Autumn arrives: The fall equinox explained in six images. Monday marks the end of astronomical summer in the Northern Hemisphere. At 10:29 p.m., the sun can ... ... <看更多>

September Equinox 23rd September There are two equinoxes every year: one in March and the other in September. This year, the September ... ... <看更多>