Fourteen Weeks in Descriptive Astronomy |
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Page 9
... feet in its diameter - a decrease so insignificant as to be imperceptible with the best instruments ; or by the annual impact of meteors equal in amount to the mass of Mercury . ( See article by Prof. Young in Popular Science Monthly ...
... feet in its diameter - a decrease so insignificant as to be imperceptible with the best instruments ; or by the annual impact of meteors equal in amount to the mass of Mercury . ( See article by Prof. Young in Popular Science Monthly ...
Page 33
... feet the first second , at eight thousand miles it would fall only four feet ; at 240,000 miles , or the distance of the moon , it would fall only about one - twentieth of an inch ( exactly .053 ) . Now the question arose , " How far ...
... feet the first second , at eight thousand miles it would fall only four feet ; at 240,000 miles , or the distance of the moon , it would fall only about one - twentieth of an inch ( exactly .053 ) . Now the question arose , " How far ...
Page 47
... feet or inches . The LIGHT OF THE SUN . - This is equal to 5,563 wax - candles held at a distance of one foot from the eye . It would require 800,000 full - moons to pro- duce a day as brilliant as one of cloudless sunshine . THE HEAT ...
... feet or inches . The LIGHT OF THE SUN . - This is equal to 5,563 wax - candles held at a distance of one foot from the eye . It would require 800,000 full - moons to pro- duce a day as brilliant as one of cloudless sunshine . THE HEAT ...
Page 50
... feet the first second ; at the sun's equator it would fall 437 feet . TELESCOPIC APPEARANCE OF THE SUN : SUN - SPOTS.- We may sometimes examine the sun at early morning or late in the afternoon with the naked eye , and at mid- day by ...
... feet the first second ; at the sun's equator it would fall 437 feet . TELESCOPIC APPEARANCE OF THE SUN : SUN - SPOTS.- We may sometimes examine the sun at early morning or late in the afternoon with the naked eye , and at mid- day by ...
Page 69
... feet ; the Earth , also , by a pea , at a distance of 215 feet ; Mars by a small pepper - corn , at a distance of 327 feet ; the minor planets by grains of sand , at dis- tances varying from 500 to 600 feet . If space will permit , we ...
... feet ; the Earth , also , by a pea , at a distance of 215 feet ; Mars by a small pepper - corn , at a distance of 327 feet ; the minor planets by grains of sand , at dis- tances varying from 500 to 600 feet . If space will permit , we ...
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Common terms and phrases
ancients Andromeda angle aphelion appearance Aries astronomers atmosphere axis body Boötes bright brilliant Canis Minor Capricornus Cassiopeia celestial centre Cepheus circle color comet conjunction constellation Cor Caroli dark density Describe diameter disk Draco earth east ecliptic equal equator equinoctial figure fixed stars full moon globe heat heavens Hercules Herschel horizon inclined inferior inferior conjunction inferior planet Jupiter latitude length light lunar Lyra magnitude Mars mean distance Mercury meridian meteors miles moon moon's motion move naked eye nearly nebula Neptune node north pole orbit Orion parallax pass path penumbra perihelion Perseus Pisces planet Polaris precession rays revolve ring rising Saturn seasons seen shadow shines shower sidereal sidereal day solar day solar system space spots summer sun's superior planet surface synodic revolution tance Taurus telescope theory tion Uranus Ursa Major Ursa Minor varies velocity Venus vernal equinox visible zodiac