Tuesday, April 1, 1980 Summer stars to twinkle in April 5 By DON MUNDAY Staff Reporter Winter stars set as summer stars net some good viewing of the heavens during April. Mercury is *paying* hide-and-seek with observers this month, rising only an hour before morning twilight. It probably will be observed on the glare of the dawn during most of April. The shrinking crescent moon, however, may be used as a guidepost in finding the planet's shadow. The bright crescent in the pre-dawn sky on April 13, and the elusive little planet just might show Venus shines this month at magnitude 4, halfway up in the western sky at sunset. On April 16th and 27th, Venus will distance from the sun, about 46 degrees—just one degree short of the maximum altitude. Roaming through Taurus this month, Venus tonight will lie near the Pleiades, star of August. Venus and the Moon on April 13. Venus will pass 9 degrees from reddish Aldebaran, the brightest star in THROUGH A telescope this month, Venus can be seen shrinking from a half-illuminated disk to only one-third full. It was Galileo who discovered that Venus goes through such phases, just as the moon does. His discovery helped prove that the planets revolve around the sun, but it also helped explain why they orbit the moon with those who preferred to think otherwise. The two bright planets rising near the top of the sky during the early evening are Mars and Jupiter. Mars is twice as large as two, and it decreases in brightness this month from magnitude -0.3 to -0.4. The moon is visible when observers of its north polar cap, which appears as a white patch on one end of the planet. Mars and Jupiter lie less than 6 degrees apart at the beginning of the month, and close in on each other throughout April. In December Mars and Jupiter are final conjunction of the current series. BOTH MARS and Jupiter are in Leo this month, and their arrangement with Leo's bluish-white star, Regulus, makes the group a compact trio of bright stars. Saturn, meanwhile, plods along at the other end of Lee and appears this month at a distance that would allow it to look through a telescope. Saturn oval bent like a watch self, because the rings are still edge-on on earth's line of sight. Saturn is high in the sky at dusk and stuck in the west before dawn. On April 17, a very thick crescent moon will pass near Aldebaran in Taurus. On April 23 the half-full moon will wander by the Mars-Jupiter-Regulus trio and will bypass Saturn April 8 and becoming new on April 15. By April 22, it will be first quarter again and fall on the last day of the month. STARGAZING, TO some people, is a lot of ball. Nothing proves this. Some balls are even evening sky and marked by Venus. One of the 12 signs of the zodiac, Taurus represents the horns of a bull. His horns form a “V” pointing down to the horizon, with the clustered Hydaes found at the convergence of the horns. The other horn is pointed upwards upon the ball a little to the north of Taurus. Another winter constellation preparing to exit the spring celestial theatre is Gemini. Two bright stars, Caustor and Pollux, mark the southern end of the night with two dinner stars at the opposite end. Red Aldebaran and brilliant Venus make Taurus hard to miss this month, but Taurus is slowly opening of earpocket skies. By mid-April, the sun will be bright enough for reappear in evening skies until October. University Daily Kansan TO FIND Gemini, draw an imaginary line from Jupiter, near the top of the sky, on over to brilliant Venuis in the west. Gemini will be found near the midpoint of this line. National Astronomy Day has been set for Saturday, April 26. As usual, the KU Observatory on top of Lindley Hall is open every clear Friday night for public viewing of the heavens. 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