While temperatures are heating up and desert flowers are starting to bloom, astronomical spring won't start until later in ...

Heat from the Sun may play a role in triggering quakes ... Earthquakes occur as a result of the constant—but, to us, imperceptibly slow—movement of tectonic plates across the Earth's surface ...

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 ...