Fourteen Weeks in Descriptive Astronomy |
From inside the book
Results 6-10 of 47
Page 27
... figure become . This figure is the ellipse . The two points F F are called the foci ( singular , focus ) . We can now under- stand Kepler's attempt , and the glorious triumph which crowned his seventeen years of unflagging toil First ...
... figure become . This figure is the ellipse . The two points F F are called the foci ( singular , focus ) . We can now under- stand Kepler's attempt , and the glorious triumph which crowned his seventeen years of unflagging toil First ...
Page 28
... figures of Tycho Brahé , and began to compare them . He tried them in every imaginable relation . Next he took their squares , then he attempted their cubes , and lastly he combined the squares and the cubes . Here was the secret ; but ...
... figures of Tycho Brahé , and began to compare them . He tried them in every imaginable relation . Next he took their squares , then he attempted their cubes , and lastly he combined the squares and the cubes . Here was the secret ; but ...
Page 46
... figures employed . The first number , 91,500,000 miles , is far beyond our grasp . Let us try to comprehend it . If there were air to convey a sound from the sun to the earth , and a noise could be made loud enough to pass that distance ...
... figures employed . The first number , 91,500,000 miles , is far beyond our grasp . Let us try to comprehend it . If there were air to convey a sound from the sun to the earth , and a noise could be made loud enough to pass that distance ...
Page 50
... figure . Curious opinions concerning solar spots . - The nat- ural purity of the sun seems to have been formerly an article of faith among astronomers , and therefore on no account to be called in question . Scheiner , it is said ...
... figure . Curious opinions concerning solar spots . - The nat- ural purity of the sun seems to have been formerly an article of faith among astronomers , and therefore on no account to be called in question . Scheiner , it is said ...
Page 56
... figure . This can be explained only on the sup- position that the sun's axis is inclined to the ecliptic ( 7 ° 15 ' ) . The spots have a motion of their own . - Besides the motion already named as assigned to the sun's rota- tion , the ...
... figure . This can be explained only on the sup- position that the sun's axis is inclined to the ecliptic ( 7 ° 15 ' ) . The spots have a motion of their own . - Besides the motion already named as assigned to the sun's rota- tion , the ...
Other editions - View all
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