![]() It's used in conjunction with declination to help astronomers locate celestial objects.ĭeclination (Dec): Declination is comparable to latitude on Earth. It covers the east-west direction and is measured in hours, minutes and seconds. Right ascension (RA): Right ascension can be considered the sky's version of longitude on Earth. Magnitude can even be measured in negative numbers, which indicate higher levels of brightness than positive numbers. ![]() Magnitude : Magnitude is a measure of how bright an object appears from Earth the lower an object's magnitude, the brighter it is. ![]() Related: Night sky: What you can see tonight If you're looking to gear up for a stargazing session, read our guides to the best telescopes and best binoculars. Gemini is full of targets for observation, both "near" and far. ![]() (Image credit: Daisy Dobrijevic) Gemini observing targets Gemini is a constellation high in the winter sky and contains a number of interesting observing targets. ![]()
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