The map at the left shows all of the stars we will study during January -- and more. To find them in the sky, it is best to start with Orion, one of the most conspicuous constellations. The stars of Orion vividly suggest the mythological figure they are supposed to represent -- a bold hunter armed with a club and sword and faced by a charging bull. To observe Orion, find a place where you have a clear view of the sky. Turn so that you are facing south. During the evening hours this month you will find Orion about halfway up from the horizon to the zenith. The zenith is the point in the...