Abstract
Deep sky observers often associate each of the seasons of the year with particular kinds of deep sky object. March and April are the season of galaxies, when the Virgo and Coma galaxy clusters are visible from both northern and southern hemispheres, and when our near neighbors like Andromeda (M31), Triangulum (M33) and the Whirlpool (M51) are high in the sky. June and July are the season of globular clusters, when these tight balls of stars can be found in rich numbers scattered in and around the constellation of Sagittarius. In the northern hemisphere, the Great Hercules cluster, M13, rides high in the sky.
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Ford, D. (2014). The Deep Sky. In: The Observer's Guide to Planetary Motion. The Patrick Moore Practical Astronomy Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-0629-1_9
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DOI: https://doi.org/10.1007/978-1-4939-0629-1_9
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