Fourteen Weeks in Descriptive Astronomy |
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Page 17
... length of time in which the eclipses of the sun and moon repeat themselves in the same order . THE GRECIANS . - In the seventh century B. C. , Thales , noted for his electrical discoveries , acquired much renown , and established the ...
... length of time in which the eclipses of the sun and moon repeat themselves in the same order . THE GRECIANS . - In the seventh century B. C. , Thales , noted for his electrical discoveries , acquired much renown , and established the ...
Page 19
... length of the year to with- in six minutes , discovered the precession of the equi- noxes , and made the first catalogue of the stars- 1081 in number . Two THE EGYPTIANS . - Egypt , as well as Chaldea , was noted for its knowledge of ...
... length of the year to with- in six minutes , discovered the precession of the equi- noxes , and made the first catalogue of the stars- 1081 in number . Two THE EGYPTIANS . - Egypt , as well as Chaldea , was noted for its knowledge of ...
Page 26
... , as at F F in the figure ; next move a pencil along with the thread , the latter being kept tightly stretched , and the point will mark a curve which is flattened in proportion - to the length of the string we use ,. 26 INTRODUCTION .
... , as at F F in the figure ; next move a pencil along with the thread , the latter being kept tightly stretched , and the point will mark a curve which is flattened in proportion - to the length of the string we use ,. 26 INTRODUCTION .
Page 27
Joel Dorman Steele. - to the length of the string we use , -the longer the string , the nearer a circle will the figure become . This figure is the ellipse . The two points F F are called the foci ( singular , focus ) . We can now under ...
Joel Dorman Steele. - to the length of the string we use , -the longer the string , the nearer a circle will the figure become . This figure is the ellipse . The two points F F are called the foci ( singular , focus ) . We can now under ...
Page 34
... length , while in London , he learned of a new and more accurate measurement of the distance from the circumference to the centre of the earth . He has- tened home , inserted this new value in his calcula- tions , and soon found that ...
... length , while in London , he learned of a new and more accurate measurement of the distance from the circumference to the centre of the earth . He has- tened home , inserted this new value in his calcula- tions , and soon found that ...
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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