Triangulum constellation

Triangulum is one of the 88 constellations, and it represents the triangle. It is highest in the sky at midnight around October 23, and its whole figure rises above the horizon from 90°N to 55°S.

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Triangulum at a glance

Represents
the triangle
Highest at midnight
October 23
Highest at 9 pm
December 7
Seen whole from
90°N to 55°S
Stars in the figure
3 stars
Origin
Ptolemy's list, 2nd century

When to see Triangulum

Triangulum is highest in the sky at midnight around October 23 and at 9 pm around December 7. Each month it is highest about two hours earlier than the month before.

The times are local solar time. Clocks on daylight saving time read about one hour later.

When Triangulum is highest each month
DateHighest at
January 156:30 p.m.
February 154:20 p.m.
March 152:30 p.m.
April 1512:30 p.m.
May 1510:30 a.m.
June 158:30 a.m.
July 156:30 a.m.
August 154:30 a.m.
September 152:30 a.m.
October 1512:30 a.m.
November 1510:30 p.m.
December 158:30 p.m.

Where to look for Triangulum

From the northern hemisphere

From 40°N, Triangulum rises in the east and sets in the west. It is highest around midnight on October 23, almost overhead.

From the southern hemisphere

From 35°S, Triangulum rises in the east and sets in the west. It is highest around midnight on October 23, 22° above the northern horizon.

Brightest stars in Triangulum

None of the stars of Triangulum is brighter than magnitude 2.3, so it is best seen from a dark place away from city lights. Its brightest stick-figure stars are about magnitude 3.

Triangulum in myth and history

Triangulum is one of the 48 constellations that the astronomer Ptolemy listed in the 2nd century.

Constellations next to Triangulum

Find Triangulum in your sky

Questions about Triangulum