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

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., ...

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 ...