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 ...

In the days since GPS was invented, many of us have lost the skill of navigating by a good old compass and map. As a family on the road in a 1991 Airstream Motorhome, we were early adapters to the GPS ...

Right ascension, a celestial coordinate dating back to Hipparchus, measures the east-west position of celestial objects along the celestial equator, starting from the vernal equinox. Right ascension, ...