A planisphere is a hand held aid used to identify which stars and constellations are visible. It's easy to use. Just turn the disc so the date lines up with the current time and it shows you what the sky looks like now! This special double-sided design makes it easier to relate to what you see in the sky, giving a less distorted view compared to the more common, traditional single sided ones. Included is Quasar's unique Planet Finder card, which gives the approximate position of the five naked eye planets, Mercury, Venus, Mars, Jupiter and Saturn.