Wandering through the realms of the cosmos, pondering its huge vastness

Triangles of the Night Sky

Here are images of the two famous triangles of the night sky — the Summer Triangle and the Winter Triangle — that I took last October.

Winter Triangle - October 5, 2011 3:42 am. This triangle is formed by the three first magnitude stars Sirius in Canis Major, Procyon in Canis Minor, and Betelgeuse in Orion. This shape is a nearly perfect equilateral triangle.

Summer Triangle - October 4, 2011 11:00 pm. This asterism sets in the west shortly after sunset around now. It consists of three bright stars: Vega in the constellation Lyra, Deneb in the constellation Cygnus, and Altair in the constellation Aquila.

These two serve as a stellar calendar, marking the seasons.

The Summer Triangle is the signature star formation of summer. Likewise, the Winter Triangle is a landmark of the winter night sky.

Though December is just around the corner, the Summer Triangle still lights up these autumn evenings. It will continue to shine after dark throughout December and January.

Meanwhile, as the Summer Triangle descends in the west around mid-evening, the Winter Triangle can be seen rising in the east.

Isn’t it amazing that these stars that make up these celestial triangles just happen to be positioned the way they are in the night sky?🙂

Both photos were taken from our suburban place in San Jose del Monte, Bulacan. 

One response

  1. nolan

    when i was about 12… as i am 28 today… i witnessed not just 3 stars.. but the whole sky of stars forming triangles and moving in one direction. at that age i didnt know what drugs were.. and i was skittish about waking my father that was right near me because i didnt want to get yelled at. so I sat there for about 1 hour watching. I seriously, as i remember it, every swinging star in the sky grouped into triangles in the sky. if you drew a lined triangle and then filled it with more stars.. thats the kinda formation they made.. and then they kept moving in one direction.:/ i have tried to look it up but dont find nothing, and noone else has ever really made this observation. If im wrong and someone has, please let me know!

    August 14, 2014 at 9:25 am

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