SkyTalk April | A Celestial Compass, Calendar & Clock
The sky’s best-known figure (with the possible exception of the constellation Orion) is the Big Dipper. The Dipper itself is actually not a constellation but only part of one—Ursae Major, the Great Bear. It’s an “asterism” or a distinctive pattern made up of parts of one or more constellations. But it surely has to be …