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Last updateFri, 16 Sep 2016 12pm

Astronomy

31 Dec 2016
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In January, Venus dominates the evenings! Find it in the southwest to west-southwest, with Mars to its upper left. In the west to west-northwest, find the Summer Triangle of Vega, Altair and Deneb. Vega is its brightest member, and Altair is the first to depart, around mid-month, if mountains don’t block your view. Fomalhaut, to the lower left of the two planets, may be easily overlooked. The eastern sky is filling up with winter’s jewels! The “Dog Star” blue-white Sirius (the brightest star) and the Little Dog Star Procyon, preceding it, rise into view below Orion’s bright shoulder, red Betelgeuse, and bright foot, blue Rigel. (Sirius, Procyon and Betelgeuse form the nearly equilateral Winter Triangle.) Follow Orion’s belt downward to Sirius, and upward to orange Aldebaran, eye of Taurus, the Bull. To the left of Orion, look for Pollux (with Castor, 4.5 degrees away). Midway between Orion’s belt and the…
01 Dec 2016
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Evening twilight: Venus rules! You won’t fail to notice this brilliant light in the southwest at dusk. Look for Mars to its upper left, and, for the first two or three weeks of December, Mercury to Venus’ lower right, provided you have an unobstructed view. The moon passes through this section of sky Nov. 30-Dec. 5. The Summer Triangle of Vega, Altair, and Deneb is not far west of overhead in twilight in early December, and drifts westward as this month progresses. Blue-white Vega is next in brightness after Venus among objects visible in December’s evening twilight. Yellow Capella in the northeast is almost as bright. To Capella’s lower right, red-orange in color, is Aldebaran, eye of Taurus, the Bull, ascending in the east-northeast to east. Later in the month, Orion’s brightest stars, reddish Betelgeuse and bluish Rigel, rise almost together not far from due east. In December at dusk,…
27 Oct 2016
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Brilliant Venus (magnitude -4.0) and fainter Saturn ( +0.5) are 4.5 degrees apart in the southwest at dusk on Nov. 1, but Venus speeds away while Saturn sinks into the solar glare, widening the gap between them to nearly 15 degrees by Nov. 11, and to 22 degrees by Nov. 18. Use binoculars to watch Venus pass background stars in Ophiuchus and Sagittarius on Nov. 4, 16, 17, and 22. Venus sets farthest south Nov. 14. By month’s end, Venus brightens to magnitude -4.2 and is noticeably higher than it was at the start of November. A telescope shows Venus in gibbous phase, 70 percent full at month’s end. Wonderful changes will happen in coming months, before Venus departs from the evening sky in late March. Mercury (magnitude -0.5) passes 3.5 degrees south (to the lower left) of Saturn on Nov. 23, but they’ll both be very low in the…