Astronomy for High Schools and CollegesH. Holt, 1881 - 512 pages |
Other editions - View all
Astronomy for High Schools and Colleges Edward Singleton Holden,Simon Newcomb No preview available - 2016 |
Astronomy for High Schools and Colleges Edward Singleton Holden,Simon Newcomb No preview available - 2016 |
Common terms and phrases
altitude angle angular appear astronomers astronomical units atmosphere attraction axis called celestial sphere centre circle clock comet constellation declination density determine diameter direction disk diurnal diurnal motion earth 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 measures Mercury meridian meteoroids meteors Milky months moon moon's motion move naked eye nearly nebula Neptune node number of stars object observer opposite orbit parallax pass perihelion period photosphere planet planetary pole position proper motion radiated radius rays refraction revolution revolves right ascension ring rotation satellites Saturn seen shadow sidereal solar system spectrum sun's supposed telescope theory tion transit Uranus vapor variable stars velocity Venus vernal equinox visible zenith
Popular passages
Page 132 - 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 132 - 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 v - ... 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 desire a more detailed and precise knowledge of the subject, or who intend to make astronomy a special study. From CA YOUNG, Professor in Princeton College : " I conclude that it is decidedly superior to anything...
Page 168 - ECLIPSES OF 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 HYi44 of the radius EB of the earth, a quantity which we readily find to be about 4600 kilometres.
Page 132 - 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 123 - The square of the period of a planet is proportional to the cube of its mean distance from the Sun.
Page 175 - 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 29 - ... instant, and to define this position by the two co-ordinates right ascension and declination. Thus we know the position of this imaginary body just as we know the position of a star whose co-ordinates are given, and we may speak of its transit as if it were a bright material point in the sky. A mean solar day is the interval of time between two consecutive transits of the mean sun over the upper meridian. Mean noon at any place on the earth is the instant of the mean sun's transit over the meridian...
Page 65 - The magnifying power of the Compound Microscope is estimated as follows. First, the diameter of the image will be to that of the object as their respective distances from the lens. Secondly, the image is magnified by the eye-glass according to the principles of the single microscope, (Art.