Fourteen Weeks in Descriptive Astronomy |
From inside the book
Results 1-5 of 20
Page 74
... of water with its teeming millions of animal- culæ . DIVISIONS OF THE PLANETS . - The planets are di- vided into two classes : ( 1 ) Inferior , or those whose orbits are within that of the earth - viz . 74 THE SOLAR SYSTEM .
... of water with its teeming millions of animal- culæ . DIVISIONS OF THE PLANETS . - The planets are di- vided into two classes : ( 1 ) Inferior , or those whose orbits are within that of the earth - viz . 74 THE SOLAR SYSTEM .
Page 75
... INFERIOR PLANET . - An inferior planet is never seen by us in the part of the sky opposite to the sun at the time of observation . It cannot recede from him as much as 90 ° , or the circumference , since it moves in an orbit entirely ...
... INFERIOR PLANET . - An inferior planet is never seen by us in the part of the sky opposite to the sun at the time of observation . It cannot recede from him as much as 90 ° , or the circumference , since it moves in an orbit entirely ...
Page 76
... inferior planet is never visible when in superior conjunction , as its light is then lost in the greater brilliancy of the sun . When in inferior conjunction , it sometimes passes in front. Fig . 19 . B ORBIT AND SEASONS OF MERCURY . 76 ...
... inferior planet is never visible when in superior conjunction , as its light is then lost in the greater brilliancy of the sun . When in inferior conjunction , it sometimes passes in front. Fig . 19 . B ORBIT AND SEASONS OF MERCURY . 76 ...
Page 77
... inferior planet . Suppose the earth to be at A , and the planet at B. Now , while the earth is passing to F , the planet will pass to D - the arc AF being shorter than BD , because the nearer a planet is to the sun the greater its ...
... inferior planet . Suppose the earth to be at A , and the planet at B. Now , while the earth is passing to F , the planet will pass to D - the arc AF being shorter than BD , because the nearer a planet is to the sun the greater its ...
Page 78
... inferior planet . - An inferior planet presents all the phases of the moon . At superior conjunction , the whole illumined disk is turned to- ward us ; but the planet is lost in the sun's rays : therefore neither Mercury nor Venus ever ...
... inferior planet . - An inferior planet presents all the phases of the moon . At superior conjunction , the whole illumined disk is turned to- ward us ; but the planet is lost in the sun's rays : therefore neither Mercury nor Venus ever ...
Other editions - View all
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