Fourteen Weeks in Descriptive Astronomy |
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Page 119
... zenith . This is the highest point it ever reaches . From this altitude it slowly de- scends , its track being represented by a spiral or screw with a very fine thread ; and in the course of three months it worms its way down to the ...
... zenith . This is the highest point it ever reaches . From this altitude it slowly de- scends , its track being represented by a spiral or screw with a very fine thread ; and in the course of three months it worms its way down to the ...
Page 131
... zenith , and increases gradually toward the horizon ( as the thick- ness of the intervening atmosphere increases ) , where it is about 33 ' . Fig . 37 . seem to be above it . For example , on. Change of place and appearance of the sun ...
... zenith , and increases gradually toward the horizon ( as the thick- ness of the intervening atmosphere increases ) , where it is about 33 ' . Fig . 37 . seem to be above it . For example , on. Change of place and appearance of the sun ...
Page 138
... zenith , since an observer at O , as well as one at R , would see the star Z directly overhead ; and ( 2 ) , that the nearer a body is to the earth the greater its parallax becomes . It has been agreed by astronomers , for the sake of ...
... zenith , since an observer at O , as well as one at R , would see the star Z directly overhead ; and ( 2 ) , that the nearer a body is to the earth the greater its parallax becomes . It has been agreed by astronomers , for the sake of ...
Page 141
... this principle , cut two circular pieces of the same size , one of black and the other of white paper . The white circle. THE SIZE OF MOON AT HORIZON AND ZENITH . APPEARANCE OF EARTH AS SEEN FROM MOON . THE MOON . 141.
... this principle , cut two circular pieces of the same size , one of black and the other of white paper . The white circle. THE SIZE OF MOON AT HORIZON AND ZENITH . APPEARANCE OF EARTH AS SEEN FROM MOON . THE MOON . 141.
Page 142
... zenith than when at the horizon . Besides these general variations in size , the moon varies in apparent size to different observers . Much amusement may be had in a large party or class by a comparison of its apparent magnitude . The ...
... zenith than when at the horizon . Besides these general variations in size , the moon varies in apparent size to different observers . Much amusement may be had in a large party or class by a comparison of its apparent magnitude . The ...
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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