The Keystone is an asterism formed by four relatively bright stars in the constellation Hercules: Pi, Eta, Zeta and Epsilon Herculis. The trapezoid-shaped pattern makes it easy for observers to identify the constellation and to find several well-known deep sky objects. On a clear night, the Keystone can be seen between the bright Vega, the brightest star in Lyra, and the stars of Corona Borealis, the Northern Crown. The asterism represents Hercules’ torso.
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The Winter Triangle, or the Great Southern Triangle, is an asterism formed by three bright stars in three prominent winter constellations.
The Winter Triangle is prominent in the night sky in the northern hemisphere during the winter months, from December to March.
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The Lyrid meteor shower, also known as the April Lyrids, is one of the oldest known meteor showers, with records dating back more than 2,600 years.
The Lyrids are an annual event that peaks around April 22 and the early morning of April 23 each year. Lyrid meteors can typically be seen from April 16 to April 25. The parent body of the meteor shower is the comet C/1861 G1, also known as Comet Thatcher.
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Arcturus, Alpha Boötis, is the brightest star in Boötes constellation and the fourth brightest star in the sky.
With an apparent magnitude of -0.04, Arcturus is the brightest star in the northern celestial hemisphere. (The three brightest stars – Sirius in Canis Major, Canopus in Carina, and Alpha Centauri in Centaurus – lie south of the celestial equator.)
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