The Sidereal Messenger: A Monthly Review of Astronomy, Volume 8Carleton College Observatory, 1889 |
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Common terms and phrases
angle aperture appear astronomical aurora axis Barnard Carleton College catalogue celestial circle clock College Observatory comet computed corona Cygni d h m Decl density diameter disk distance E. E. Barnard earth eclipse ephemeris equator equatorial error exposure eye-piece feet give given glass Harvard College Observatory heat inches instrument interest July June Jupiter Lick Observatory light limb magnitude Mars mass matter mean measures ment Mercury meridian Meridian Circle MESSENGER meteors method moon nearly nebula object observations occultation orbit parallax period phenomena photographic planet plates polar position Professor proper motion right ascension ring rotation satellites Saturn seen Sept shutter sidereal solar solar eclipse spectrum spots stars sun-spot sun's surface telescope temperature tion totality U. S. Naval Observatory Uranus variable stars velocity Venus visible
Popular passages
Page 336 - ASTRONOMY WITH AN OPERA-GLASS. -** A Popular Introduction to the Study of the Starry Heavens with the Simplest of Optical Instruments. By GARRETT P.
Page 142 - South Declination, and of all Nebulae and Star Clusters in the same Region which are visible in Telescopes of moderate powers. With Explanatory Text by Dr.
Page 419 - VI. The spectroscopic observations of Mr. Keeler show conclusively that the length of a coronal line is not always an indication of the depth of the gaseous coronal atmosphere of the sun at that point, and hence to indicate the important conclusion that the true atmosphere of the sun may be comparatively shallow.
Page 140 - Scotland, and Professor of Practical Astronomy in the University of Edinburgh, in the room of Professor Piazzi Smyth, resigned.
Page 35 - I knew that the diameters of the fixed stars are not proportionally magnified with higher powers as the planets are; therefore I now put on the powers of 460 and 932, and found the diameter of the comet increased in proportion to the power, as it ought to be, on a supposition of its not being a fixed star, while the diameters of the stars to which I compared it were not increased in the same ratio. Moreover, the comet being magnified much beyond what its light would admit of, appeared hazy and ill-defined...
Page 96 - STAR ATLAS. Containing Maps of all the Stars from 1 to 6.5 Magnitude between the North Pole and 34° South Declination, and of all Nebulae and Star Clusters in the same Region which are visible in Telescopes of moderate powers.
Page 304 - The advantage is even greater in photographing nebulae or other faint surfaces. Moreover, this form of lens will enable each photographic plate to cover an area several times as great as that which is covered by an instrument of the usual form. The time required to photograph the entire sky is reduced in the same proportion. A telescope of the...
Page 14 - Other Worlds Than Ours," that "among all the orbs which circle around the sun, one only, and that almost the least of the primary planets, should exhibit clearly and unmistakably the signs which mark a planet as the abode of life.
Page 305 - ... constant use in Cambridge for the last four years, and is now in Peru photographing the southern stars. It has proved useful for a great variety of researches. Stars have been photographed with it too faint to be visible in the fifteen-inch refractor of the observatory. Its short focal length enables it to photograph as faint stars as any which can be taken with an excellent photographic telescope having an aperture of thirteen inches. The eight-inch telescope will photograph stars about two...
Page 61 - ... in a direction opposite to that of the hands of a watch, while a contrary movement will be observed on the south side; along the current no vortices will be formed.