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Last updateWed, 27 Sep 2017 1pm

Astronomy

30 Nov 2015
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In evening twilight in December, the Summer Triangle is well up in the west, getting lower as the month progresses. Its brightest member is blue-white Vega, at its northwest (lower right) corner. Altair marks the southern point of the Triangle, and Deneb the northeast corner, above Vega. Follow the Summer Triangle within the first hour after sunset until mid-January, when Altair sinks into the twilight glow. Solitary Fomalhaut, marking the mouth of the Southern Fish, drifts low across the southern sky in December’s evening twilight. From late in December’s second week into early January, try to find Mercury very low in the southwestern twilight glow; binoculars make the search easier. Yellowish Capella climbs in the northeast, while to its lower right, ascending in the east-northeast to east, we find red-orange Aldebaran, eye of Taurus the Bull. This star is at opposition to the sun each year around the start of…
31 Oct 2015
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In evening twilight during November, the holdover Summer Triangle, with its brightest member blue-white Vega at its northwest corner, drifts slowly westward from nearly overhead. Meanwhile, lonely Fomalhaut, mouth of the Southern Fish, moves from southeast toward the south. Bright Arcturus departs in the west-northwest, making way for almost equally bright Capella, rising in the northeast. Very low in the southwest to west-southwest, if mountains don’t block your view, Saturn and Antares (8 degrees to the planet’s left) are accessible with binoculars early in the month, before their departure. Aldebaran, eye of Taurus the Bull, is at opposition as Earth passes between that star and the sun each year around Dec. 1; look for a reddish star rising in the east-northeast during twilight in late November. Arabic in origin, the name Aldebaran means the follower, alluding to the star’s pursuit of the Pleiades or Seven Sisters star cluster across the…
29 Sep 2015
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During October and early November, there are exceptionally beautiful gatherings of planets in the morning sky. A waning crescent moon graces the lineup of planets on Oct. 8-11. Oct. 22-29, three planets will converge into a compact group, and on Oct. 25 and 26, the brightest of these, Venus and Jupiter, will pair very closely. With daylight saving time still in effect through October, a brief sky watch about an hour before sunrise would provide a wonderful, rewarding display of planets at a time not unreasonably early. Thursday, Oct. 8, one hour before sunrise: Venus gleams brilliantly within 3 degrees to the lower left of the crescent moon. Bright Jupiter shines 13 degrees to the lower left of Venus. Faint reddish Mars glows 4 degrees above Jupiter and 9 degrees to the lower left of Venus. Mercury, just beginning a morning apparition, rises in the east, within 19 degrees to…