These graphics explain why Easter Sunday changes each year based on ancient interpretations of the solar and lunar cycles.

The next full moon is at 12:56 pm EST on Monday, May 12 and is known as the Flower Moon. Here is a look at all the full moons ...

Carvings on a 12,000-year-old monument in Turkey appear to mark solar days and years, making it possibly the oldest solar ...

Year-round schools have long been thought to potentially improve academics by reducing the length of summer break. Research ...