Elements of Astronomy: Descriptive and Physical ... |
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Page 13
... vary during the time of observation . Some of the largest of them exceed in square miles the surface of the whole Earth , and are often seen for months together . Very rarely , no spots are visible . Dr. Herschel supposes that the Sun ...
... vary during the time of observation . Some of the largest of them exceed in square miles the surface of the whole Earth , and are often seen for months together . Very rarely , no spots are visible . Dr. Herschel supposes that the Sun ...
Page 14
... varying phases , like the Moon , proving them to be opaque bodies , shining with light borrowed from the Sun ; and also demonstrating , that they revolve in orbits of inferior magnitude to the orbit of the Earth . Hence they are called ...
... varying phases , like the Moon , proving them to be opaque bodies , shining with light borrowed from the Sun ; and also demonstrating , that they revolve in orbits of inferior magnitude to the orbit of the Earth . Hence they are called ...
Page 16
... vary from 27 to 163 millions of miles . About 35 days before or after its inferior conjunction , its light is such as to cast a sha- dow by night , and to be visible at noonday . Two transits of Venus like those of Mercury , occur at ...
... vary from 27 to 163 millions of miles . About 35 days before or after its inferior conjunction , its light is such as to cast a sha- dow by night , and to be visible at noonday . Two transits of Venus like those of Mercury , occur at ...
Page 18
... varying phases , and its eclipses ; topics to be resumed in a future chapter . Light is unequally reflected from different parts of the moon's disc , as viewed by the unaided eye . When examined by a telescope of high magnify- ing ...
... varying phases , and its eclipses ; topics to be resumed in a future chapter . Light is unequally reflected from different parts of the moon's disc , as viewed by the unaided eye . When examined by a telescope of high magnify- ing ...
Page 19
... vary from 9 seconds to 29 seconds , in its apparent diameter . The angle of its orbit with the Ecliptic is about 2 degrees . Why is Mars called a superior planet ? What is its magnitude ? -its density ? its distance from the Sun ? -the ...
... vary from 9 seconds to 29 seconds , in its apparent diameter . The angle of its orbit with the Ecliptic is about 2 degrees . Why is Mars called a superior planet ? What is its magnitude ? -its density ? its distance from the Sun ? -the ...
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Common terms and phrases
24 hours 95 millions ABERRATION OF LIGHT altitude angle annular annular eclipse aphelion apparent diameter Aries Astronomy atmosphere attraction axis brass meridian called celestial centre century circle comets constellations degrees density disc Dominical letter double stars east elevated equal Equator estimated fixed stars given place heavenly bodies heavens Herschel horizon illustrate Jupiter Latitude Longitude luminary luminous lunar eclipses magnitude material worlds mean distance Mercury miles the hour millions of miles minutes Moon Moon's motion nearest nodes observation opposite orbit organs of vision parallax perihelion period planets polar pole primary refraction revolution revolves round right ascension rings rising rotation round the Earth round the Sun satellites Saturn set the index solar eclipse solstice southern hemisphere Sun's place supposed surface telescope thousand miles tides tion torrid zone transit of Venus true place turn the globe twilight velocity vernal equinox visible Zodiac
Popular passages
Page 121 - The works of the LORD are great, sought out of all them that have pleasure therein.
Page 136 - Behold I have given you every herb bearing seed, which is upon the face of all the earth, and every tree in the which is the fruit of a tree yielding seed, to you it shall be for meat.
Page 103 - Hitherto shalt thou come and no farther, and here shall thy proud waves be stayed.
Page 2 - BBOWN, of the said district, hath deposited in this office the title of a book, the right whereof he claims as author, in the words following, to wit : " Sertorius : or, the Roman Patriot.
Page 61 - evidence of things not seen," in the fulness of Divine grace ; and was profound on this, the greatest concern of human life, while unable even to comprehend how the " inclination of the earth's axis to the plane of its orbit" could be the cause of the change of the seasons.
Page 115 - Rectify the globe to the latitude of the place; bring the sun's place in the ecliptic to the meridian, and set the index to XII.
Page 104 - These are thy glorious Works, Parent of good, Almighty! thine this universal frame, Thus wondrous fair: thyself how wondrous then, Unspeakable! who sitt'st above these heavens To us invisible, or dimly seen In these thy lowest works; yet these declare Thy goodness beyond thought, and power divine.
Page 138 - Who by searching can find out God ; who can find out the Almighty to perfection...
Page 80 - The squares of the periods of revolution of any two planets are proportional to the cubes of their mean distances from the sun.
Page 65 - ... angles. In northern Latitudes, the smallest angle made by the Ecliptic and horizon, is when Aries rises, at which time Libra sets ; the greatest, when Libra rises, at which time Aries sets.