Photo of the Summer Triangle by philliefan99

Look Up has discussed the Summer Triangle a couple of times before. The asterism (a pattern of stars that are not an official constellation) rises at dusk, just in time for the solstice on Monday, the time when the Northern Hemisphere tilts closest to the Sun, the longest day of the year, and, yes, the real first day of summer. Click through to philliefan99’s photo above to see where he’s marked the ‘triangle’ points — the stars Deneb, Vega, and Altair — in the 20 second exposure.

>> It’s Planet Tic-Tac-Toe in the sky right after dusk. The ringed-planet Saturn hangs near the Moon in the western sky; diagonally down and to the right in the center square is Mars, and further down the line is Venus, setting around 10:30 p.m. tonight.

>> If your dad is an aviation buff, celebrate Father’s Day weekend by taking him to the Smithsonian Air and Space Museum’s Udvar-Hazy Center for “Become A Pilot Family Day” today from 10 a.m. to 3 p.m. Aside from the hangar full of ridiculous planes, many more will be set-up outside with pilots to take for your questions and cockpits ready to try out. Get prizes, go on special tours, catch a robotics demo and more.