Items related to Elementary Astronomy; A Beginner's Text-Book
Synopsis
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1899 edition. Excerpt: ...to an Earth covered by an ocean of uniform depth. To fit it to the facts as they are a thousand circumstances must be taken into account which depend on the modifying effects of continents and islands, of deep and shallow seas, of currents and winds. Practically the time of high tide at any station is predicted in the "Tide-Tables" by adding to the time of the Moon's transit over the meridian a quantity that is determined from observation and not from theory.--Describe the changes of the shape of the Moon's disk from new moon to the next new moon. Does the Moon shine by her own light? What part of the globe of the Moon is illuminated by the Sun? About what time does the new moon rise? the full moon? CHAPTER XII. ECLIPSES OF THE SUN AND MOON 27. The Earth's Shadow--the Moon's Shadow--Lunar Eclipses--Solar Eclipses--Occultations of Stars by the Moon.--A point of light L sends out rays in every direction. If an opaque disk VO is interposed in the path of some of these rays it will form a shadow on the side furthest from the light. All the space between the lines Pig. 139.--The Shadow Of A Disk VO Formed By A Point Of Light L And Projected On A Screen T8. L V, LO, and other lines drawn from the point L to the borders of VO will be dark. The regiou Vost'k dark and it is called the shadow of VO. If the source of light is not a mere point the shadow is not so simple. The candleflame AB shines on the sphere DC and illuminates onehalf of it. The region to the right of the sphere and between the lines BDS' and ACS receives no light at all. If a screen is interposed the shadow is shown quite black at S'S. None of the region to the right of the sphere between the lines AP' and BP is fully illuminated. Some of the candle-flame is cut off...
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- PublisherRareBooksClub.com
- Publication date2013
- ISBN 10 1230039767
- ISBN 13 9781230039763
- BindingPaperback
- LanguageEnglish
- Number of pages112
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