March 20 is the vernal equinox, which traditionally marks the first day of spring in the Northern Hemisphere. According to EarthSky, the spring equinox and full moon haven’t occurred this closely together since 2000. As a result, the Northern and Southern Hemisphere see approximately 12 hours of daylight and 12 hours of darkness. The date of the “equilux” — when sunrise and sunset occur exactly 12 hours apart — was March 17. So, while it’s probably too early to hang up your winter coat for the season, the arrival of the spring equinox means that cold days are usually numbered.

Source: Washington Post March 20, 2019 10:52 UTC