Longitude by Lunar Distances: Illustrated with Examples Worked Out Step by Step, and with References to Works on Practical Astronomy and to the "Nautical Almanac."

Front Cover
W.H. Allen, 1885 - 79 pages
0 Reviews

What people are saying - Write a review

We haven't found any reviews in the usual places.

Selected pages

Other editions - View all

Common terms and phrases

Popular passages

Page 74 - Mean time of the Semidiameter passing may be found by subtracting 0-19 from the Sidereal Time.
Page 4 - This rule, with some modification, will answer for calculating the time of an occultation of a fixed star or planet by the moon. In this case the star's longitude is to be found in Table XXXVII.
Page 5 - The degree of accuracy with which sextant observations can be made, depend on the health of the observer. A clear head, a steady hand, a sharp eye, a calm mind, are necessary for success as an observer.
Page 7 - Pisces' (Bailey) ; ie when the apparent motion of a planet is contrary to that of the sun in the ecliptic. 51. disease : trouble, disquiet. Palsgrave,
Page 18 - ... PM is the local meridian, PG the Greenwich meridian, PS the hour circle through a star and PT the hour circle through the vernal equinox. Then GPT is the Greenwich sidereal time (GST) found from the chronometer regulated to keep Greenwich sidereal time. TPS is the star's right ascension (RA) found from the table of apparent places of stars in the Nautical Almanac.

Bibliographic information