Page:Gods Glory in the Heavens.djvu/392

This page has been proofread, but needs to be validated.
356
SYNOPTICAL TABLES.
Comets calculated before 1849, retrograde, 100
Great comet of 1861, distance from the Earth on June 30, . 17,000,000
Great comet of 1861,— — — surmised by Hind that the Earth passed through its tail, 30th June
Great comet of 1861,— — — length of tail as seen at Rome 118°
Great comet of 1861, length of tail— — — as seen at Paris 45°
Great comet of 1861,— — — polarisation of tail strong, but no trace in nucleus till 3d July
Great comet of 1861,— — — tail seen to flicker and disappear for an instant. 4th July
Encke's comet, before perihelion, diameter diminished in two months to 1-90th
Encke's comet— — — after perihelion, diameter increased in six days from 1 to . 40
Rotation of comet of 1825 (doubtful), 19h. 37m.
Mass of Lexell's comet less than (Earth's = 1) 1-5000th
Chances unfavourable to collision between earth and a comet (comet's diam. = l-4th of earth's), 281,000,000
DOUBLE STARS.
Number of binary systems with assigned periods, about 15
Period of Castor, with semi-axis of 8", in years, 252
Period of— — — χ Ursro Majoris, with semi-axis of 3″.8 59
Period of— — — γ Virginis, with semi-axis of 3″.6, 182
Causes of colour in stars, intrinsic and complementary, 2
NEBULÆ.
Number of stars covered by the Moon in parts of the Milky Way, 2000
Number of stars— — — in some clusters, 50,
This article is issued from Wikisource. The text is available under Creative Commons Attribution-Share Alike 4.0 unless otherwise noted. Additional terms may apply for the media files.