We’ve all heard of it (or at least we think we have), and we know it’s one of the holidays in May—but what is May Day, ...

While meteorological spring has been around for a few weeks, Thursday marks the start of astronomical spring. That means the ...

(The opposite holds true for the Southern Hemisphere, where June brings the winter solstice and the shortest day of the year.) Read on for some more intriguing facts about the summer solstice.