Thursday is the first day of spring, or the vernal equinox, in the Northern Hemisphere. During an equinox, the center of the sun is on the same plane as the equator. After the vernal equinox in March, the Northern Hemisphere tilts toward the sun until the June solstice, when the sun begins to migrate back south.

It’s far too early to try to fry an egg on the sidewalk, but according to weather lore, the spring equinox is an ideal time to try to balance an egg!