قراءة كتاب Half-hours with the Telescope Being a Popular Guide to the Use of the Telescope as a Means of Amusement and Instruction.
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Half-hours with the Telescope Being a Popular Guide to the Use of the Telescope as a Means of Amusement and Instruction.
HALF-HOURS WITH THE TELESCOPE
Being a popular guide to the use of the telescope as a means of amusement and instruction.
BY
Richard A. Proctor, B.A., F.R.A.S.,
Author of "Saturn and its System," Etc.
With Illustrations on Stone and Wood.
An undevout astronomer is mad:
True, all things speak a God; but, in the small
Men trace out Him: in great He seizes man.
YOUNG.
New York:
G.P. Putnam's Sons.
1873.
London:
Printed by William Clowes and Sons, Stamford Street and Charing Cross.
Fronticepeice
| Map I. The Sky Jan. 20, 10 P.M. Feb. 19, 8 P.M. Mar. 21, 6 P.M. |
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| Map II. The Sky Apr. 20, 10 P.M. May 21, 8 P.M. Jun. 21, 6 P.M. |
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| Map III. The Sky Jul. 22, 10 P.M. Aug. 23, 8 P.M. Sep. 23, 6 P.M. |
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| Map IV. The Sky Oct. 23, 10 P.M. Nov. 22, 8 P.M. Dec. 21, 6 P.M. |
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PREFACE.
The object which the Author and Publisher of this little work have proposed to themselves, has been the production, at a moderate price, of a useful and reliable guide to the amateur telescopist.
Among the celestial phenomena described or figured in this treatise, by far the larger number may be profitably examined with small telescopes, and there are none which are beyond the range of a good 3-inch achromatic.
The work also treats of the construction of telescopes, the nature and use of star-maps, and other subjects connected with the requirements of amateur observers.
R.A.P.
January, 1868.
CONTENTS.
| PAGE | |
| CHAPTER I. | |
| A HALF-HOUR ON THE STRUCTURE OF THE TELESCOPE | 1 |
| CHAPTER II. | |
| A HALF-HOUR WITH ORION, LEPUS, TAURUS, ETC. | 33 |
| CHAPTER III. | |
| A HALF-HOUR WITH LYRA, HERCULES, CORVUS, CRATER, ETC. | 47 |
| CHAPTER IV. | |
| A HALF-HOUR WITH BOOTES, SCORPIO, OPHIUCHUS, ETC. | 56 |
| CHAPTER V. | |
| A HALF-HOUR WITH ANDROMEDA, CYGNUS, ETC. | 66 |
| CHAPTER VI. | |
| HALF-HOURS WITH THE PLANETS | 74 |
| CHAPTER VII. | |
| HALF-HOURS WITH THE SUN AND MOON | 93 |
DESCRIPTION OF PLATES.
PLATE I.—Frontispiece.
This plate presents the aspect of the heavens at the four seasons, dealt with in Chapters II., III., IV., and V. In each map of this plate the central point represents the point vertically over the observer's head, and the circumference represents his horizon. The plan of each map is such that the direction of a star or constellation, as respects the compass-points, and its elevation, also, above the horizon, at the given season, can be at once determined. Two illustrations of the use of the maps will serve to explain their nature better than any detailed description. Suppose first, that—at one of the hours named under Map I.—the observer wishes to find Castor and Pollux:—Turning to Map I. he sees that these stars lie in the lower left-hand quadrant, and very nearly towards the point marked S.E.; that is,