Quote:
Originally Posted by George
Ok, so the NGC number itself is only a general r.a. indicator with about every increment of roughly 325 representing the next hour angle of r.a.
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Very roughly. With the Virgo and Coma clusters, the single range from 12-13 hours in RA encompasses (pretty exactly) NGC numbers from 4000-5000 all by itself (at one time that was a handy thing for galaxy aficionados to know, as was having NGC 3000 at about 10 hours).