Synopsis
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. 1887. Excerpt: ... 7. Shew how Deviation may be determined at sea by observation of the Sun's Amplitude. Explain, with a diagram, the effect of Refraction upon this observation. (June, 1875.) 8. In finding Variation of Compass, is it advisable to observe the Amplitude of the Moon for that purpose? 9. In latitude 59" 10' N., the Amplitude is double the declination. Find the Variation, having given the Compass bearing of the Sun E. 17 N, and the deviation 5Q 30' W. (February, 1879.) IX. MISCELLANEOUS PROBLEMS. 1. Find the time on November 7th (Civil Day) when at a place in lat. 56 21' S., long. 108 W., the star Regulus will have an altitude equal to its declination, before reaching the meridian; having given from the Nautical Almanac--R.A. Regulus 10h lm 55s-7; Dec. Regulus 12 33' 30" N.; R.A.M.S. at G.M. noon Nov. 6th, 15h 2m 16s-4. (May, 1878.) 2. Show that if the declination of a star be equal to its longitude, its latitude must be equal to its Right Ascension. (June, 1878.) 3. At a certain place in North latitude Rigel (Dec. 8 20' S., R.A. 5h 8m) and Pollux (Dec. 28 19' N., R.A. 7h 38m) rise at the same instant. Required the latitude. (April, 1876.) 4. At a certain place the Sun rose at 6h 15m A.M., and the meridian zenith distance was three times as great as the latitude. Find the latitude. (November, 1875.) 5. Investigate a formula for finding the length of day at a given place on a given day. What deductions may be drawn from this formula with regard to the length of day under the following circumstances?--(1.) When the latitude=0. (2.) When the declination is the complement of the latitude, and of the same name. (3.) When the declination is greater than the complement of the latitude. (December, 1877.) 6. Write down the formula for finding the time when, at a given pl...
"synopsis" may belong to another edition of this title.
