Carvings on a 12,000-year-old monument in Turkey appear to mark solar days and years ... cycles for both the Moon and the Sun, which pre-date other calendar finds of this type by “many millennia ...

The next total solar ... afternoon sun and cover it up, creating the unusual celestial phenomenon of the total solar eclipse. It will be the last time a total solar eclipse will cross the U.S ...

The stone causeway of the solar observatory in Mount Tlaloc, Mexico, aligns with the rising sun on February 23–24, in coincidence with Mexica calendar’s new year. CREDIT: Ben Meissner.

Eclipse coming soon: A total solar eclipse in April will cross 13 ... Our normal calendar years are typically 365 days long, or the number of days it takes Earth to orbit the sun.

While its ability to mark the seasons is well understood, some experts have argued that Stonehenge could be a kind of ancient solar ... calendar. The idea was that the 30 sarsen lintels (cross ...