Courtesy of EarthSky A Clear Voice for Science Our sky chart
shows the Summer Triangle asterism as it appears at late
evening. As seen from mid-northern latitudes, Vega – the Summer
Triangle’s brightest star – shines high overhead around 10:00
p.m. daylight saving time (9:00 p.m. standard time) this
evening. Altair resides to the lower left (southeast) of Vega,
and Deneb lies to Vega’s left (east). As the stars drift
westward during the night, Deneb will swing upward, to replace
Vega as the overhead star some two hours later, or around
midnight. Of course, the stars aren’t really moving. It is the
Earth’s rotation that causes the stars to move westward during
the night, and the sun to go westward during the day. The three
stars of the Summer Triangle shine so wonderfully brilliantly
that you can see them from light-polluted cities or on a moonlit
night. Yes, the sky will be drenched in moonlight tonight.
Outside of our sky chart, tonight’s almost-full waxing gibbous
moon beams beneath the Summer Triangle and