No matter whether you go by the astronomical calendar or the meteorological calendar, both agree that the country has now entered fall. The autumnal equinox officially occurred on Monday at 2:19 p.m., ...

NASA outlines a full 2026 astronomy calendar featuring eclipses, planetary alignments, meteor showers, supermoons, and seasonal milestones visible from different parts of Earth.

Editor’s note: This story has been updated to correct the date of winter solstice. (WHTM) – A quick look at the calendar shows the first day of spring, landing in mid-March, is right around the corner ...

Meteorologists and other scientists mark the change in seasons using calendar days, rather than the movement of the sun. Measuring seasons by precise dates allows scientists to more accurately track ...