Fourteen Weeks in Descriptive Astronomy |
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Page 98
... angles to it . The circumference of the earth is about 25,000 miles . Its density is about 5 times that of water . Its weight is 6,069,000,000,000,000,000,000 tons . The inequalities of its surface , arising from build- ings , valleys ...
... angles to it . The circumference of the earth is about 25,000 miles . Its density is about 5 times that of water . Its weight is 6,069,000,000,000,000,000,000 tons . The inequalities of its surface , arising from build- ings , valleys ...
Page 110
... angle is called the obliquity of the ecliptic . II . Parallelism of the axis . - In all parts of the orbit , the axis of the earth is parallel to itself and constantly points toward the North Star . * This is only an instance of what is ...
... angle is called the obliquity of the ecliptic . II . Parallelism of the axis . - In all parts of the orbit , the axis of the earth is parallel to itself and constantly points toward the North Star . * This is only an instance of what is ...
Page 112
... angle it may be thrown . A man slating a roof wishes to throw a slate to the ground ; he simply whirls it , and as it descends it will strike on the edge without breaking . As long as a top spins there is no danger of its falling ...
... angle it may be thrown . A man slating a roof wishes to throw a slate to the ground ; he simply whirls it , and as it descends it will strike on the edge without breaking . As long as a top spins there is no danger of its falling ...
Page 121
... angles to the ecliptic . In order that the plane of the terrestrial equator should pass through the sun's centre 50 " earlier , it is necessary that the plane itself should slightly change its place . The axis of the earth is always ...
... angles to the ecliptic . In order that the plane of the terrestrial equator should pass through the sun's centre 50 " earlier , it is necessary that the plane itself should slightly change its place . The axis of the earth is always ...
Page 124
... angle QCP equals the obliquity of the ecliptic . In this position the equatorial pad- ding we have spoken of the ring of matter about the equator - is turned , not exactly toward the sun , but is elevated above it . Now the attraction ...
... angle QCP equals the obliquity of the ecliptic . In this position the equatorial pad- ding we have spoken of the ring of matter about the equator - is turned , not exactly toward the sun , but is elevated above it . Now the attraction ...
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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