A distinctive group of stars that is not one of the recognised constellations.

The Plough is a cracking good example, it is not a constellation, it is an asterism that is part of the constellation Ursa Major. Another well known asterism, brought to popularity by Patrick Moore during the early days of his long-running TV astronomy programme ‘The Sky at Night’ is the Summer triangle of Altair, Deneb and Vega. I think that southern hemisphere astronomers refer to it as the ‘Northern Triangle’.

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