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Last updateWed, 27 Sep 2017 1pm

Astronomy

27 Feb 2015
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March 2015 at dusk: Early in the month, the four brightest “stars,” in order of brilliance, are: Venus, in the west; Jupiter, in the eastern sky; Sirius, the “Dog Star,” 40 degrees up in the south as seen from the Coachella Valley; and Canopus, less than 4 degrees up when it passes due south about 21 minutes before Sirius does. From the Coachella Valley, you must choose your site carefully to see Canopus, or mountains might block your view. From my abode in Palm Springs, I see Canopus blink out when it goes behind a mountainside several minutes before it reaches its high point. From Palm Springs and Desert Hot Springs, Canopus passes due south only 4 degrees up in a dark sky at 7:32 p.m. on March 1, and then four minutes earlier each day, to 7:08 p.m. on March 7, and suddenly 8:04 p.m. on Sunday, March 8—an…
30 Jan 2015
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Two planets and a star far outshine all competitors at dusk in February. They are: Venus, of magnitude -4, low in the west-southwest, shifting toward the west and slowly gaining altitude as this month progresses; Jupiter, of magnitude -2.6, starting very low in the east-northeast, moving into the east and climbing about 1 degree higher each day (if viewed at the same stage of twilight daily); and blue-white Sirius, the “Dog Star” and brightest of nighttime stars, twinkling at magnitude -1.4 and ascending through southeast toward south-southeast at dusk as February runs its course. Follow these three bright objects at dusk in coming months. Sirius will disappear into the west-southwest twilight glow during May, while Venus and Jupiter remain in view until at least late in July. February’s other naked-eye evening planet is Mars, appearing as a red “star” of magnitude +1.2 to +1.3, not far from Venus all this…
02 Jan 2015
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The year begins with the three other terrestrial (rocky) planets of our solar system—Mercury, Venus and Mars—low in the west-southwest to southwest during evening twilight. Their span shrinks from 27 degrees on Jan. 1, to less than 20 degrees Jan. 11-20. Bright Venus, of magnitude -3.9, draws attention to the gathering. Find Mercury just to its lower right, within 3 degrees Jan. 1-17, 2 degrees Jan. 4-15, and 1 degree Jan. 8-12. On Jan. 10 at dusk, Mercury appears within two-thirds of a degree to the lower right of Venus! As seen from Earth, Mercury will not overtake Venus, and will instead fall just short. This is a quasi-conjunction, an approach within 5 degrees without an actual conjunction, when two planets share the same “x-coordinate.” Mercury shines at magnitude -0.8 Jan. 1-11, fades through magnitude 0 on Jan. 19, magnitude +1 on Jan. 22, and magnitude +2 on Jan. 24,…