Fourteen Weeks in Descriptive Astronomy |
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Page 85
... days , or nearly three of our months . Mercury revolves upon its axis in about the same time as the earth , so that the length of the Mercurial day is nearly the same as that of the terrestrial one . Though Mercury thus completes a sidereal ...
... days , or nearly three of our months . Mercury revolves upon its axis in about the same time as the earth , so that the length of the Mercurial day is nearly the same as that of the terrestrial one . Though Mercury thus completes a sidereal ...
Page 91
... days , at the mean rate of 22 miles per second ; hence her year is equal to about seven and one half of our months . This is a sidereal revolu- tion , as it would appear to an observer at the sun , but a synodic revolution is 584 days ...
... days , at the mean rate of 22 miles per second ; hence her year is equal to about seven and one half of our months . This is a sidereal revolu- tion , as it would appear to an observer at the sun , but a synodic revolution is 584 days ...
Page 223
... day and night , for three years and nine months to span the gulf and reach a stopping point at the nearest fixed ... sidereal journey far back in the past , perhaps before the creation of man ! MOTION OF THE FIXED STARS . - It will aid ...
... day and night , for three years and nine months to span the gulf and reach a stopping point at the nearest fixed ... sidereal journey far back in the past , perhaps before the creation of man ! MOTION OF THE FIXED STARS . - It will aid ...
Page 234
... day the right - hand side of the map should be held downward , and the Big Dipper will be directly below the north star . 234 THE SIDEREAL SYSTEM . THE CONSTELLATIONS NORTHERN CIRCUMPOLAR CONSTELLATIONS •
... day the right - hand side of the map should be held downward , and the Big Dipper will be directly below the north star . 234 THE SIDEREAL SYSTEM . THE CONSTELLATIONS NORTHERN CIRCUMPOLAR CONSTELLATIONS •
Page 238
... day it would be fifty years before we should miss it . Calculation of latitude from Polaris . - By an ob- server at ... SIDEREAL SYSTEM .
... day it would be fifty years before we should miss it . Calculation of latitude from Polaris . - By an ob- server at ... SIDEREAL SYSTEM .
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Common terms and phrases
ancients Andromeda angle aphelion appear Aries astronomers atmosphere axis Boötes bright brilliant Canis Minor Capricornus Cassiopeia cause Celestial Sphere centre Cepheus circle color comet conjunction constellation Cor Caroli dark density Describe diameter disk earth east ecliptic equal equator equinoctial figure fixed stars full moon globe heat heavenly bodies heavens Hercules Herschel horizon inclined inferior conjunction inferior planet Jupiter latitude length light luminous lunar Lyra magnitude Mars mean distance Mercury meridian meteors miles moon's motion move naked eye nearly nebula Neptune night node north pole Orion parallax pass path penumbra perihelion Perseus Pisces polar Polaris precession rays revolve ring rising Saturn seasons seen shine side sidereal sidereal day solar day solar system solstice space spots summer sun's surface synodic revolution tance Taurus telescope theory tion Uranus Ursa Major Ursa Minor varies velocity Venus vernal equinox visible winter Zodiac