Triangulum constellation

Triangulum is one of the 88 constellations, and it represents the triangle. It is highest in the sky at midnight around 23 October, 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
23 October
Highest at 9 pm
7 December
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 23 October and at 9 pm around 7 December. Each month it is highest about two hours earlier than the month before.

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

When Triangulum is highest each month
DateHighest at
15 January6:30 PM
15 February4:20 PM
15 March2:30 PM
15 April12:30 PM
15 May10:30 AM
15 June8:30 AM
15 July6:30 AM
15 August4:30 AM
15 September2:30 AM
15 October12:30 AM
15 November10:30 PM
15 December8:30 PM

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 23 October, 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 23 October, 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