Triangulum has been recognized as a triangle from ancient times. It lies south of Andromeda and north of Aries, east of Pisces and west of Perseus. Triangulum is a small constellation that is best seen in late autumn and winter. Triangulum was originally seen as an equilateral triangle, much like the Greek letter delta, and commemorates their accomplishments in mathematics and science.

Genitive	Trianguli
Visible	November
Visible Where	Northern
Visible from US
Width	1:12
Height	11°31"
Brighness Rank	64
Size (sq. degrees)	132
Size Rank	78
Opposition	Oct 28
Milky Way Brightness	0