Astronomy for Schools and Colleges |
From inside the book
Results 1-5 of 48
Page 14
... earth's surface they might be viewed , were represented by supposing that the globe of the earth was situated centrally within an im- mensely larger hollow sphere of the heavens . The vis- ible portion , or upper half of this hollow ...
... earth's surface they might be viewed , were represented by supposing that the globe of the earth was situated centrally within an im- mensely larger hollow sphere of the heavens . The vis- ible portion , or upper half of this hollow ...
Page 17
... earth was only a point in comparison with the apparent sphere of the fixed stars . This was shown by the uniformity of the diurnal motion ; if the earth had any sensible ... earth's surface . He will then see THE CELESTIAL SPHERE . 17.
... earth was only a point in comparison with the apparent sphere of the fixed stars . This was shown by the uniformity of the diurnal motion ; if the earth had any sensible ... earth's surface . He will then see THE CELESTIAL SPHERE . 17.
Page 18
Simon Newcomb, Edward Singleton Holden. observer on the earth's surface . He will then see every thing above m N P W FIG . 6 . this plane , and nothing below it . If NES is his eastern horizon , stars will appear to rise at various ...
Simon Newcomb, Edward Singleton Holden. observer on the earth's surface . He will then see every thing above m N P W FIG . 6 . this plane , and nothing below it . If NES is his eastern horizon , stars will appear to rise at various ...
Page 21
... earth's equator . Let L be a place on the earth , PEP Q , Pp being the ... surface is equal to the declination of the zenith of that place , since the ... earth's surface in a north and south direction from one pole to the other . These ...
... earth's equator . Let L be a place on the earth , PEP Q , Pp being the ... surface is equal to the declination of the zenith of that place , since the ... earth's surface in a north and south direction from one pole to the other . These ...
Page 23
... surface of the earth . To give precision to the ideas , we present a brief con- densation of this subject , with ... earth's centre , and which is so called in distinction to the sensible horizon , which is the plane tangent to the earth's ...
... surface of the earth . To give precision to the ideas , we present a brief con- densation of this subject , with ... earth's centre , and which is so called in distinction to the sensible horizon , which is the plane tangent to the earth's ...
Other editions - View all
Common terms and phrases
altitude amount angle angular appear astronomers atmosphere attraction axis called celestial sphere centre circle clock comet constellation declination described determine diameter direction disk diurnal diurnal motion earth earth's surface east eclipse equal equator fixed stars force gravitation heat heavenly bodies heavens Hence HERSCHEL horizon hour angle inferior conjunction interval Jupiter kilometres known latitude latter length light longitude lunar magnitude Mars mass mean distance measured Mercury meridian meteoroids meteors Milky minutes months moon moon's motion move naked eye nearly nebula Neptune node number of stars object observer orbit parallax pass perihelion period photosphere planet planetary pole position proper motion radius ratio rays refraction revolution revolve right ascension ring rotation satellites Saturn seen shadow sidereal solar system spectrum spots sun's supposed telescope theory tion transit Uranus velocity Venus vernal equinox visible zenith
Popular passages
Page 134 - To every action there is always opposed an equal reaction: or, the mutual actions of two bodies upon each other are always equal, and directed to contrary parts.
Page 134 - The change of motion is proportional to the motive force impressed; and is made in the direction of the right line in which that force is impressed.
Page 170 - THE MOON. The mean distance of the moon from the earth is about 60 radii of the latter, while, as we have just seen, the length 'EV of the earth's shadow is 217 radii of the earth. Hence when the moon passes through the shadow she does so at a point less than three tenths of the way from E to V. The radius of the shadow here will be...
Page 134 - Every body continues in its state of rest or of uniform motion in a straight line, unless it is compelled to change that state by forces impressed upon it.
Page 125 - The square of the period of a planet is proportional to the cube of its mean distance from the Sun.
Page 177 - If the orbit of the moon around the earth were in or near the plane of the ecliptic there would be an eclipse of the sun at every new moon, and an eclipse of the moon at every full moon. But...
Page 459 - If this matter is self-luminous, it seems more fit to produce a star by its condensation than to depend on the star for its existence...
Page 400 - B' is zero, the mean distance will become infinite. Hence, ih this case the body will fly off to an infinite distance from the sun and never return. Much less will it return if the velocity is still greater. Such a velocity will make the value of a algebraically negative and will correspond to the hyperbola. If we take one kilometre per second as the unit of velocity, and the mean distance of the earth from the sun as the unit of distance, the value of...
Page 339 - Mars to see an object the size of a large animal on the satellite. This short distance and rapid revolution make the inner satellite of Mars one of the most interesting bodies with which we are acquainted. It performs a revolution in its orbit in less than half the time that Mars revolves on its axis. In consequence, to the inhabitants of Mars, it would seem to rise in the west and set in the east. It will be remembered that the...
Page v - To facilitate its use by students of different grades, the subject-matter is divided into two classes, distinguished by the size of the type. The portions in large type form a complete course for the use of those who desire only such a general knowledge of the subject as can be acquired without the application of advanced mathematics. The portions in small type comprise additions for the use of those students who either...