This dimension groups celestial objects by the constellation in which they appear in the sky. Wikipedia notes that in 1922 "the International Astronomical Union (IAU) formally accepted the modern list of 88 constellations," each covering its own fixed region of the sky. Browsing this way shows every notable object found within one constellation.
Facts
Comparison
Field Origin Era Orion
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Sources
1. Wikipedia: Stellar classification
Wikimedia FoundationStellar classification, History section, 1901 Cannon sentenceQuote, Stellar classification, History section, 1901 Cannon sentence
In 1901, Annie Jump Cannon returned to the lettered types, but dropped all letters except O, B, A, F, G, K, M, and N used in that order, as well as P for planetary nebulae and Q for some peculiar spectra.
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