September 2025 Note​s

★  About 90 minutes after Sunset ★

Constellations
September is still a good month to view the thickest and brightest part of the Milky Way Band which hangs just west of due south and directly above the southern horizon! If you can get to a dark site, the band appears almost three dimensional (with a lot of detail) from the southern horizon to the top of the sky around Cygnus.

And, speaking of Cygnus, at the top of the sky is the Summer Triangle. The three bright stars that form it are in the constellations Cygnus, Lyra and Aquila. Aquila is the lowest in the sky. The Triangle is big, bigger than any constellation but it does stand out, once you “find” it. It is worth trying to identify because once you have accomplish this, you will probably be able to see it for a lifetime—it will be a Summer and Fall treat.

Due West and above the horizon is the bright star Arcturus in the constellation Bootes. Above Bootes is the constellation Corona Borealis. There is a star in this constellation that is invisible to the naked eye but is expected to be easily seen with the eyes once it flares up—hopefully within a year—an event that happens about every 80 years. The star is called 
T Coronae Borealis.