NASA satellites and sensors constantly take the pulse of our planet, measuring how Earth changes by the day, season, year, and decade. Researchers and resource managers analyze those measurements and ...

This date marks the beginning of time according to the ISO 8601 time and date standard, chosen for its significance as the anniversary of the International Bureau of Weights and Measures' creation.

(Photo/Alex Brandon)(Alex Brandon / AP) Under an international standard called ISO 8601, a missing value for a date is coded as May 20, 1875, because that was the date of an international ...