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." |
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Longitude by Lunar Distances: Illustrated with Examples Worked Out Step by ... Henry Wilberforce Clarke No preview available - 2014 |
Common terms and phrases
9th March altitude of moon's apparent altitude apparent lunar distance approximate appt assumed longitude Astronomy body calculation Challis Chauvenet chronometer cleared computed contracted correction corresponding cos2 cosec December determining difference earth's east and west equation equatorial horizontal parallax error find the moon's formula geocentric lunar distance given gives Greenwich Greenwich mean Hence hour angle increasing interval latitude longitude lower limb lunar dist lunar observations lunar star March mean noon method moon moon's apparent Moon's augmented semi-diameter moon's centre Moon's equatorial horizontal moon's lower Nautical Almanac Navigation nearly Note observation Observed lunar distance obtained October Pegasi planet polar precision recorded reduced refraction result rigorous says September sextant shade sidereal sinē star lunars star's step sun lunar sun's Sun's geocentric Table taken taking true vertical zenith distance
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
| Title | 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." |
| Author | Henry Wilberforce Clarke |
| Publisher | W H Allen, 1885 |
| Original from | Harvard University |
| Digitized | Sep 6, 2007 |
| Length | 79 pages |
| Export Citation | BiBTeX EndNote RefMan |