The Moon's visibility, including circumpolarity (remaining above the horizon) and invisibility, is determined by its declination, analogous to terrestrial latitude. A celestial object's declination ...

With an apparent brightness of magnitude 9.7, the object's light requires 17 minutes and 18 seconds to traverse the distance to our planet.

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 ...