Els equinoccis són importants per a marcar les estacions. Atès que estan a l 'eclíptica, el Sol passa a través de cadascun d' ells una vegada a l' any. Quan el Sol passa a través de l' equinocci d' estiu (normalment el 21 de març), aquest a travessa l' equador celest de sud a nord, indican el final de l' hivern a l' hemisferi nord. De manera similar, quan el Sol passa per l' equinocci de tardor (normalment el 21 de setembre), aquest a travessa l' equador celest de nord a sud, significant el final de l' hivern a l' hemisferi sud.
The Equinoxes are important for marking the seasons. Because they are on the Ecliptic, the Sun passes through each equinox every year. When the Sun passes through the Vernal Equinox (usually on March 21st), it crosses the Celestial Equator from South to North, signifying the end of Winter for the Northern hemisphere. Similarly, when the Sun passes through the Autumnal Equinox (usually on September 21st), it crosses the Celestial Equator from North to South, signifying the end of Winter for the Southern hemisphere.