So, when we measure the angle between the vernal equinox and the hour circle of the object, that’s its right ascension. It’s measured in hours, minutes, and seconds.

Easter falls on the Sunday that follows the first full moon occurring on or after the day of the spring equinox. So it seems like Easter should be this weekend. Here's why it isn't.

The spring equinox will occur at 5:01 a.m. EDT on Thursday. Here's what to know about the start of the spring season.

Spring is here — officially, at least.The vernal equinox arrived on Thursday, marking the start of the spring season for the Northern Hemisphere and the fall in the Southern Hemisphere. On the ...

Spring is here — officially, at least.The vernal equinox arrived on Thursday, marking the start of the spring season for the Northern Hemisphere and the fall in the Southern Hemisphere. On the ...