When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit: Kinga Krzeminska/Getty Images The equator is the imaginary line that horizontally ...

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 ...

The Earth is encircled by an imaginary line known as the equator. Positioned at 0 degrees latitude, it separates the planet into the Northern and Southern Hemispheres. The equator is one of the five ...

New research shows ancient tropical oceans once held more oxygen than cooler regions, reshaping where early life could survive and evolve.