From the December 2008 issue

Phil Harrington’s Binocular Universe: The Winter Triangle

February 2009: Three bright stars frame Monoceros and hold many open star cluster delights.
By | Published: December 29, 2008 | Last updated on May 18, 2023
Three of winter’s brightest stars — Betelgeuse, Sirius, and Procyon — form a prominent equilateral triangle that frames a surprisingly barren part of the February sky. This vast empty region is labeled Monoceros the Unicorn, but I doubt many of us are able to see such a whimsical creature among the constellation’s dim stars.