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Right ascension and declination are the celestial equivalent of longitude and latitude. RA is measured in hours from a position known as the vernal equinox, a kind of ‘Greenwich Meridian’ on a star chart. There are 24 hours of RA around the sky. Declination is measured in degrees from the celestial equator.
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Zack, M., Gannon, A., McRoberts, J. (2018). Seeking Out the Dark. In: Stargazing Under Suburban Skies. The Patrick Moore Practical Astronomy Series. Springer, Cham. https://doi.org/10.1007/978-3-319-90116-9_1
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DOI: https://doi.org/10.1007/978-3-319-90116-9_1
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