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Astronomy by Observation; An Elementary Text-Book for High-Schools and Academies

Astronomy by Observation; An Elementary Text-Book for High-Schools and Academies


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1886 Excerpt: ...pleasure and advantage, viz., the power to look at the changes in the heavens with intelligent recognition. 119. The Superior Planets.--For reasons which will be made clear a little further on, the planets are divided into two classes, called Superior and Inferior Planets. Jupiter, Saturn, and Mars are the superior planets which can be seen with the unaided eye. 120. How to find Jupiter, Mars, or Saturn.--Except when they are very near the sun, Jupiter, Mars, and Saturn can be seen at some hour of every clear night. The student's knowledge of them will probably be chiefly gained by watching them in the evening before bedtime, and it is well to form a habit of observing them at dark. These planets come into the sky from the east. It will give reality to the study of them if the student who begins this chapter will get a good almanac, and find where they are then, or when they will become evening stars. Three steps are to be taken: 1. To find out when they are evening stars. 2. The student must know where in the heavens to look for them. 3. He must understand how they can certainly be known when seen. A few words will be said on each subject: 121. I. How to tell when a Planet is in the Evening Sky.--They come in at opposition, they go out at conjunction. The dates of the oppositions of Jupiter, Mars, and Saturn are given in any good astronomical almanac under the following symbols; 8 means opposition; O, the sun; 8 U O, opposition of Jupiter with the sun; 8 O, opposition of Saturn with the sun; 8 $ O, opposition of Mars with the sun. The publishers of this book will send out with every copy sold a printed slip containing any oppositions coming within three years from the current year. The oppositions of Saturn come once in about a year; those of Jupiter, ever...


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Product Details
  • ISBN-13: 9781159901134
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 56
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1159901139
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 118 gr

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