Linked from
The 19 pages that link to March equinox, each with the reason it gives.
Right ascensionRelated: This point is the zero-hour origin of right ascension.
Tropical yearRelated: The tropical year can be measured between successive March equinoxes.
NowruzRelated: Its timing anchors Nowruz to the seasonal change celebrated as the new year.
Equatorial coordinate systemRelated: It provides the zero point for right ascension.
Double Third FestivalRelated: The festival falls during the broader seasonal transition into spring.