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News for Norther Colorado and the world

Sunday, December 21, 2014

EarthSky Tonight—August 25, Orion the Hunter and Sirius the Dog Star

Courtesy of EarthSky
A Clear Voice for Science
www.EarthSky.org

phase Aug 25 EarthSky Tonight—August 25, Orion the Hunter and Sirius the Dog Star 10aug25 430 300x300 EarthSky Tonight—August 25, Orion the Hunter and Sirius the Dog Star The very noticeable constellation Orion the Hunter can be seen ascending in the southeast before dawn at this time of year. Orion will be visible in the evening by winter, but right now the Hunter lords over the southeastern sky at dawn’s first light.

Orion was low in the west after sunset last spring, and, in early summer, this constellation was behind the sun as seen from Earth. Orion only returned to visibility in Earth’s sky about a month ago. (See our July 29 sky chart.) When a constellation becomes visible again, after being behind the sun, it always appears in the east before sunrise. Because – as Earth orbits the sun – all the stars rise two hours earlier with each passing month, Orion is now higher at dawn than a month ago.

As seen from the northern hemisphere, Orion precedes Sirius the Dog Star into the sky. After Orion first appears at morning dawn, you can count on Sirius to appear in the morning sky a few weeks later. You should be able to see Sirius at or before dawn right now – unless you live at far northern latitudes. However, even there, it won’t be much longer!

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Written by EarthSky



Astronomy Picture of the Day from NASA/JPL

CHANDRA Photo Album

U.S. Naval Observator Astronomical Information center

Universe Today

StarDate Online

Sky and Telescope

National Geographic

Space Com

Amazing Space

The York County Astronomical Society

Scope City

James S McDonnell Planetarium

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