Astronomical Tools

Before you head outside to see tonight’s sky, check out our interactive astronomical tools to see what’s up. For a quick glance at the sky, use our most popular software by far, the Interactive Sky Chart, and create a customized, naked-eye sky map. (Need help? Click here.) Then plan your night with the almanac — find out when the Sun sets, when twilight begins, when the Moon is up, and when the five brightest planets rise and set. This tool will even alert you when stars and planets pass close to each other in a conjunction.

Interested in finding the International Space Station, mapping Mars, or telling apart Jupiter’s moons? Wondering what eyepieces and accessories will really pay off in resolving and imaging power for your telescope? Forget what phase the Moon is in tonight? Each of our javascript apps below is designed to make skygazing a little easier — and more fun!