Guthrie, nebulous glow round Venus, [253]
Hadley, Saturn's dusky ring,[ 86];
reflecting telescope, [109]
Haerdtl, Winnecke's comet,[ 94]
Hale, luminous outburst on sun, [161];
daylight coronal photography, [179]
spectrum of prominences, [195] [198]
prominence photography, [197] [198]
photographs of faculæ, [198] [377]
carbon in chromosphere, [200]
bright lines in fourth-type stars, [381]
reflectors and refractors, [432]
Hall, Asaph, parallax of the sun, [241];
discovery of Martian satellites, [282]
rotation of Saturn, [302]
double star measurements, [419]
Hall, Chester More, invention of achromatic telescope, [112]
Hall, Maxwell, rotation of Neptune, [305]
Halley, stellar proper motions, [9];
composition of nebulæ,[ 22]
observation of η Carinæ,[ 48]
eclipse of 1715 [ 66],[ 68]
predicted return of comet,[ 88]
magnetic theory of auroræ, [130]
transits of Venus, [233]
lunar acceleration, [271]
origin of meteors, [327]
Halm, magnetic relations of latitude variation, [259]
Hansen, solar parallax from lunar theory, [230]