Popular Astronomy, Volume 51Goodsell Observatory of Carleton College, 1943 |
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Page 106
... atmosphere . " The reason that more light is seen near the horizon is because the horizontal line of sight of an observer , say through an atmosphere 500 miles deep , is four times as long as a line of sight directly vertical . There ...
... atmosphere . " The reason that more light is seen near the horizon is because the horizontal line of sight of an observer , say through an atmosphere 500 miles deep , is four times as long as a line of sight directly vertical . There ...
Page 420
... atmosphere . Such a meteor in the hypothetical Moon's atmosphere would be of mag- nitude 13 or 14 , as seen from the Earth , and would easily escape de- tection . For each million square miles of the Earth's surface , there is about one ...
... atmosphere . Such a meteor in the hypothetical Moon's atmosphere would be of mag- nitude 13 or 14 , as seen from the Earth , and would easily escape de- tection . For each million square miles of the Earth's surface , there is about one ...
Page 421
... atmosphere , but at the same time the density gradient is low . For years the twilight arc of Mars has indicated an atmosphere of considerable extent , yet the density at the surface of Mars is very low . At a height of 20 miles ...
... atmosphere , but at the same time the density gradient is low . For years the twilight arc of Mars has indicated an atmosphere of considerable extent , yet the density at the surface of Mars is very low . At a height of 20 miles ...
Contents
Frontispiece Plate 1 The Moon | 9 |
The Moon Wm W Payne | 16 |
Concerted Observation of the Aurora M A Veeder | 22 |
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altitude American angle appears asteroids Astronomical Society ataxite atmosphere August brighter brightness catalogs celestial colour comet Copernican Copernicus Cygni December determined diameter distance Earth eclipse Ephemeris equinox error estimates explosion eyepiece fall February feet fireball given Goodsell Observatory Greenwich Harlow Shapley Harvard Harvard College Observatory January Jupiter latitude light curve longitude lunar magnitude March Mare Imbrium Mars mass mathematics maximum meteorite method miles Moon Moon's motion navigation nebulae Notes Nova object observations obtained occultation orbit OTERMA parallax path period photographic planet plates Pleione POPULAR ASTRONOMY position present probably Professor proper motions reports rotation Saturn SCRIPTA MATHEMATICA seen siderites solar spectral spectral type spectroscopic sphere SS Cygni stellar surface telescope theory tion Tucson University Variable Star velocity Venus visible visual visual magnitude volume