Travelers need a map when driving to unfamiliar destinations whether they’re going to the other side of town or across the country. The map is a model of the real world and knowing how to navigate ...

Minor Heat, Xiaoshu in Chinese, is the 11th solar term. It begins when the Sun reaches the celestial longitude of 105° and ends when it reaches the longitude of 120°. It more often refers in ...

- (astronomy) the equatorial coordinate specifying the angle, measured eastward along the celestial equator, from the vernal equinox to the intersection of the hour circle that passes through an ...