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How big is the summer triangle observed from the earth?
The summer triangle consists of Vega in Lyra, Tianjin IV in Cygnus and Altair in Eagle.

You must find Vega before you can find it. It is the brightest star in summer. Standing in the western sky and looking east, you can see two bright stars. They are Altair and Tianjin IV, and Cygnus flies like a swan. Tianjin IV is in the head of the swan, and Altair is just to the south of these two stars.

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