It was already known that at the spring equinox a snake of sunlight slithers down one side of the pyramid’s central staircase—a sight witnessed every year by thousands of tourists. Some walk ...

Have you ever seen an equinox? On Monday ... seven triangular shadows that resemble a snake appear to move down the pyramid steps. This so-called “descent of the serpent” can be very popular.

When is the first day of spring? So long, winter! The first day of spring is almost upon us, and we’re counting down the days ...