Elements of Astronomy: Illustrated with Plates, for the Use of Schools and Academies, with Questions |
From inside the book
Results 1-5 of 43
Page 6
... passing through their centres , which are called axes . The time , in which the heavenly bodies turn on their axes , is vari- ous ; but generally the largest turn quickest . A wire passing through the centre of an apple properly ...
... passing through their centres , which are called axes . The time , in which the heavenly bodies turn on their axes , is vari- ous ; but generally the largest turn quickest . A wire passing through the centre of an apple properly ...
Page 7
... passing through this circle , is called the plane of the ecliptic . ( The surface of the paper on which the figure is drawn , properly represents a PLANE . ) The ecliptic , and in fact all circles , whether great or small , are divided ...
... passing through this circle , is called the plane of the ecliptic . ( The surface of the paper on which the figure is drawn , properly represents a PLANE . ) The ecliptic , and in fact all circles , whether great or small , are divided ...
Page 8
... passes from the north side of the plane of the ecliptic to the south , is called its descending node ; where it passes from the south to the north , its ascending node . In order that what has been said may be well understood , it may ...
... passes from the north side of the plane of the ecliptic to the south , is called its descending node ; where it passes from the south to the north , its ascending node . In order that what has been said may be well understood , it may ...
Page 9
... passing through BF is diffused over a surface 9 times greater than BF ; consequently , the heat and light at any point in DS is nine times less , than at a point in BF . Thus , as the square of the distance in- creases , heat and light ...
... passing through BF is diffused over a surface 9 times greater than BF ; consequently , the heat and light at any point in DS is nine times less , than at a point in BF . Thus , as the square of the distance in- creases , heat and light ...
Page 12
... passing from D , ( which point is called its inferior conjunction , ) through E to C , it will appear below or ... passes from A to F ; conse- quently Venus must pass from D to d , before it is seen below the sun . So while Venus moves ...
... passing from D , ( which point is called its inferior conjunction , ) through E to C , it will appear below or ... passes from A to F ; conse- quently Venus must pass from D to d , before it is seen below the sun . So while Venus moves ...
Other editions - View all
Common terms and phrases
angle aphelion apparent magnitude appear to move Aries ascertained astronomers atmosphere axis Boston called celestial equator celestial poles centre of gravity circle clock comets consequently constellation dark declination degree of heat difference direction disk Dominical Letter earth's surface east eastward eclipse Epact equal equinoxes fall Golden Number heat and light heavenly bodies heavens hemisphere Hence horizon hour Illustrate inhabitants Jupiter latitude length less London longitude lunar lunar eclipse Mercury meridian meteor minutes moon's nodes moon's orbit motion move round nearer nearly night noon o'clock obliquely observed parallax passing penumbra phenomena primary planets prime meridian PROB reckoned refraction retrograde motion revolution revolve round right ascension round the earth round the sun satellites Saturn secondary planets SECT seen shadow signs solar system solstice south latitude stars stone sun and moon sun's place sun's rays supposed telescope tides tion Uranus Venus visible zenith
Popular passages
Page 29 - In the solitude of the seas, we hail a star as a friend from whom we have been long separated. Among the Portuguese and the Spaniards, peculiar motives seem to increase this feeling ; a religious sentiment attaches them to a constellation, the form of which recalls the sign of the faith planted by their ancestors in the deserts of the new world...
Page 29 - The two great stars which mark the summit and the foot of the Cross having nearly the same right ascension, (see No.
Page 28 - I was agitated by a fear unknown to those who love a sedentary life. It seemed painful to me to renounce the hope of beholding those beautiful constellations which border the southern pole. Impatient to rove in the equinoctial regions, I could not raise my eyes...
Page 112 - The most remote were about 9 or 10 miles distant from each other, in a line differing little from the course of the meteor. It is therefore probable, that the successive masses fell in this order, the most northerly first, and the most southerly last We think we are able to point out three principal places where stones have fallen, corresponding with the three loud cannon-like reports, and with the three leaps of the meteor, observed by Mr.
Page 112 - ... most northerly first, and the most southerly last. We think we are able to point out three principal places where stones have fallen, corresponding with the three loud cannon-like reports, and with the three leaps of the meteor observed by Mr. Staples. There were some circumstances common to all the cases. There was in...
Page 66 - When the sun and star are both together at °p , they are in the same meridian ; but when the star comes to 1, and the sun to a, they are not in the same meridian, but the sun is westward of the star's meridian ; consequently as the earth turns on its axis from west to east, any particular place will come under the sun's meridian sooner than under the star's meridian ; that is, it is noon by the sun before it is by the star or by a clock. (For were the sun where the star is, the sun would agree with...
Page 15 - ... below, seem to bid defiance to the laws of gravitation. Around the base of these frightful eminences, are strewed numerous loose and unconnected fragments, which time seems to have detached from their parent mass ; and when we examine the rents and ravines which accompany the over-hanging cliffs, we expect every moment that they are to be torn from their base, and that the process of destructive separation which we had only contemplated in its effects, is about to be exhibited before us in tremendous...