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15 cm shows absorption angle and separation beautiful ﬁeld binary system bluish bright elliptical bright stars brighter central star centre culminates close pair cm will show common proper motion companion conspicuous constellation culminates at midnight dark deep yellow diffuse nebulae diﬂicult direct motion double stars Elegant pair elliptical eg estimated extra-galactic nebulae faint stars fairly bright ﬁeld of scattered ﬁeld sprinkled ﬁne ﬁeld ﬁrst gaseous nebula globular cluster hazy irregular John Herschel little change long period binary luminous Milky nucleus object for small open cluster orange star orbit outliers pale yellow pair pale yellow star planetary nebula prism band proper motion suggests Ptolemy radiation real change region resolved retrograde motion scattered stars single prism image small apertures sown with stars spectral type spectroscopic binary spectrum spiral nebula sprinkled with stars star ﬁeld starry ﬁeld Struve Struve’s measures white pair William Herschel