Fourteen Weeks Course in Descriptive Astronomy |
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Page 78
... rays : therefore neither Mercury nor Venus ever presents a full circular appearance , like the full moon . A little before or after superior conjunction , an inferior Fig . 21 . E S W PHASES OF AN INFERIOR PLANET . planet may be seen ...
... rays : therefore neither Mercury nor Venus ever presents a full circular appearance , like the full moon . A little before or after superior conjunction , an inferior Fig . 21 . E S W PHASES OF AN INFERIOR PLANET . planet may be seen ...
Page 79
... rays is invisible to us . Retrograde motion of a superior planet . - Suppose the earth to be at E and the planet at L , and that we move on to G while the planet passes on to 0- the distance EG being longer than LO ( just the reverse of ...
... rays is invisible to us . Retrograde motion of a superior planet . - Suppose the earth to be at E and the planet at L , and that we move on to G while the planet passes on to 0- the distance EG being longer than LO ( just the reverse of ...
Page 83
... but never exceeds 30 ° . * If we watch it closely , we shall find that it again ap- * This distance varies much , owing to the eccentricity of Mer cury's orbit . proaches the sun and becomes lost in his rays , MERCURY . 83.
... but never exceeds 30 ° . * If we watch it closely , we shall find that it again ap- * This distance varies much , owing to the eccentricity of Mer cury's orbit . proaches the sun and becomes lost in his rays , MERCURY . 83.
Page 84
Joel Dorman Steele. proaches the sun and becomes lost in his rays , Some days afterward , just before sunrise , we can see the same star in the east , rising higher each morn- ing , until its greatest elevation equals that which it ...
Joel Dorman Steele. proaches the sun and becomes lost in his rays , Some days afterward , just before sunrise , we can see the same star in the east , rising higher each morn- ing , until its greatest elevation equals that which it ...
Page 88
... rays , and in a few weeks after sinks far down toward the horizon , but , on account of Mercury's elliptical orbit , when in perihelion the planet approaches so near the sun that the heat and light are ten times as great as that we ...
... rays , and in a few weeks after sinks far down toward the horizon , but , on account of Mercury's elliptical orbit , when in perihelion the planet approaches so near the sun that the heat and light are ten times as great as that we ...
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Common terms and phrases
ancients aphelion appear Aries astronomers atmosphere axis Boötes bright brilliant Canis Minor Capricornus Cassiopeia cause celestial Celestial Sphere 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 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 Polaris precession rays revolve ring rising Saturn seasons seen shine side sidereal sidereal day solar day solar system solstice space sphere 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
Popular passages
Page 6 - One God, one law, one element, And one far-off divine event, To which the whole creation moves.
Page 129 - ... while the Earth remaineth seed-time and harvest, and cold and heat, and summer and winter, and day and night shall not cease.
Page 283 - That nothing walks with aimless feet ; That not one life shall be destroyed, Or cast as rubbish to the void, When God hath made the pile complete...
Page 289 - A solar day is the interval between two successive passages of the sun across the meridian of any place. If the earth were stationary in its orbit, the solar day would be of the same length as the sidereal ; but while the earth is turning around on its axis, it is going forward at the rate a'i 360° in a year, or about 1° per day.
Page 29 - The squares of the periods of revolution of any two planets are proportional to the cubes of their mean distances from the sun.
Page 29 - If you forgive me, I rejoice ; if you are angry, I can bear it. The die is cast, the book is written, to be read either now or by posterity, I care not which. It may well wait a century for a reader, as God has waited six thousand years for an observer.
Page 192 - We see it as Columbus saw America from the shores of Spain. Its movements have been felt, trembling along the far-reaching line of our analysis, with a certainty hardly inferior to that of ocular demonstration.
Page 31 - Nature, such as the seven metals, &,c., which it were tedious to enumerate, we gather that the number of planets is necessarily seven. Moreover, the satellites are invisible to the naked eye, and therefore can exercise no influence over the earth, and therefore would be useless, and therefore do not exist.
Page 20 - All these facts were attempted to be accounted for by an incongruous system of " cycles and epicycles," as it is called. The advocates of this theory assumed that every planet revolves in a circle, and that the earth is the fixed centre around which the sun and the heavenly bodies move. They then conceived that a bar, or something equivalent, is connected at one end with the earth ; that at some part of this bar the sun is attached ; while between that and the earth, Venus is fastened — not to...
Page 206 - Threat'ning the world with famine, plague, and war ; To princes, death ; to kingdoms, many crosses ; To all estates, inevitable losses ; To herdsmen, rot ; to ploughmen, hapless seasons ; To sailors, storms ; to cities, civil treasons.