Astronomy — The Winter Triangle
Most star maps and sky guides identify the prominent Summer Triangle formed by Vega, Deneb, and Altair. Less often noted is its winter counterpart formed by Sirius, Procyon, and Betelgeuse. These triangles share some similarities. Each straddles the Milky Way and consists of two relatively nearby stars (Vega and Altair, Sirius and Procyon) and a distant one (Deneb and Betelgeuse). The brightest stars of each triangle are quite alike. Both are white with the slightest trace of blue.
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