FRIDAY, APRIL 24 ■ Face north just after nightfall and look very high. There you'll find the Pointers, the end stars of the Big Dipper's bowl, on the meridian pointing down toward Polaris straight below. From the Pointers to Polaris is about three fists at arm's length. And whenever the Pointers are highest there on the north meridian, Leo walks westward across the south meridian at his highest. SATURDAY, APRIL 25 ■ The Moon will occult 1st-magnitude Regulus for most of North and Central America today. Regulus will vanish behind the Moon's dark limb during twilight for the much of the Eastern Seaboard, but during late afternoon's broad daylight for telescope users farther west. Your telescope may be able to show Regulus through a clear blue daytime sky. For the details, open Bob King's See the Moon Hide Regulus . The April Moon crossing springtime Leo. On Saturday the 25th, if you have a clear blue sky, get your telescope on the Moon in late afternoon (for North America).…