Denning, observations of Mercury, [246] [247];
mountain on Venus, [253]
rotation of Jupiter, [290]
red spot, [295]
periodicity of markings, [297]
rotation of Saturn, [302]
meteors of 1885 [336]
of 1892 [338]
stationary radiants, [341]
Denza, meteors of 1872 [334]
Derham, theory of sun-spots,[ 53];
ashen light on Venus, [255]
Deslandres, eclipse expedition, [187];
rotation of corona, [188]
prominence photography, [198]
hydrogen spectrum in prominences, [198] [383]
photographs of Jupiter, [297]
radial movements of Saturn's rings, [300]
helium absorption in stars, [376]
stellar radial velocities, [406]
Diffraction, corona explained by,[ 67],[ 70], [181];
spectrum, [139] [210] [223] [439]
Dissociation in the sun, [152] [206]-210;
in space, [312]
Doberck, orbits of double stars,[ 38], [418]
Dollond, discovery of achromatic telescope, [4],[112]
Donati, discovery of comet, [323];
spectra of comets, [342]
of stars, [372]
Doppler, effect of motion on light, [200]