Home > Asterism, Constellations, Ephemeris Program > 06/23/2016 – Ephemeris – Tis the season to view the Summer Triangle

06/23/2016 – Ephemeris – Tis the season to view the Summer Triangle

June 23, 2016

Ephemeris for Thursday, June 23rd.  Today the Sun will be up for 15 hours and 34 minutes, setting at 9:32, and it will rise tomorrow at 5:58.  The Moon, 3 days past full, will rise at 11:43 this evening.

Now that summer is here, the asterism or informal constellation called the Summer Triangle can be seen 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 its is by far the most distant of the three.  The third star of the Summer Triangle is seen farther below and right of Vega.  It is Altair in Aquila the eagle, and the closest.  Altair is 16.7 light years away, Vega is 25 light years while Deneb may be a whopping 2600 light years away.   With a light year at 6 trillion miles.  That’s mind boggling to think in miles at least.

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


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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