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06/23/2014 – Ephemeris – It’s summer, so where is the Summer Triangle?

June 23, 2014 Comments off

Ephemeris for Monday, June 23rd.  Today the sun will be up for 15 hours and 33 minutes, setting at 9:31.   The moon, half way from last quarter to new, will rise at 4:09 tomorrow morning.  Tomorrow the sun will rise at 5:58.

Now that it’s summer it’s time to look for the Summer Triangle in the sky.    It’s seen rising in the east as it gets dark.  Highest of the three bright stars is Vega in the constellation Lyra the harp, whose body is seen in a narrow parallelogram nearby.  The second star of the triangle is Deneb lower and left of Vega, It appears dimmer than Vega because it is by far the most distant of the three.  The third star of the Summer Triangle is seen farther below and a right of Vega.  It is Altair in Aquila the eagle, and the closest.  Altair is 16.5 light years away, Vega is 27 light years while Deneb actually one of the brighter stars known, is a whopping 2600 light years away, give or take.  It’s distance is not well-known.  (24  08:54  Venus 1.3°N of Moon)

Times are for the Traverse City/Interlochen area of Michigan.  They may be different for your location.

Addendum

The Summer Triangle July 5, 2012 at 11 p.m. Created using Stellaruim and The Gimp.

The Summer Triangle. Created using Stellarium and The Gimp.

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