The equatorial coordinate system projects Earth's latitude and longitude onto the celestial sphere, using declination (angular distance from the celestial equator, measured in degrees) and right ...

A new search engine will soon turn your night sky images into powerful research data and identify the twinkling objects in them with just the click of a button. The Astrometry.net database will hunt ...

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 ...

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 ...