An essential tool for every astronomer. The star atlas that makes it really easy to pick the best objects, make your own observation list and use it when you are outside + free Apple Watch app Ad Astra contains detailed maps of all 88 constellations, descriptions of more than 1200 of objects: star clusters, planetary nebulae, galaxies, double stars and variable stars. By downloading and using Ad Astra - Sky Atlas you accept these terms.