The Northern Hemisphere's spring — or vernal — equinox can land between March 19 and 21, depending on the year. Its fall – or autumnal — equinox can land between Sept. 21 and 24.

Did you know that some of the oldest human-made structures on Earth align precisely with the rising sun on the summer ...

The saguaro cactus is the iconic plant of the Arizona borderlands, and in June and early July, its fruit ripens ...

These newcomers brought their many traditions with them—including begging for treats. But trick-or-treating—a term that only started appearing in the 1920s—really took off stateside after ...