Find on the star map and name the three brightest stars with right ascension from 18h to 21h. Determine their equatorial coordinates.

a Lyra (a = 18h37m, d = 38 ° 47 ¢), a Eagle (a = 19h51m, d = 8 ° 52 ¢), a Swan (a = 20h41m, d = 45 ° 17 ¢)

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