## Lunar and horary tables, for ... ascertaining the longitude |

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### Common terms and phrases

12 hours 24 hours according added answering App App APPARENT ALTITUDE APPARENT DISTANCE applied astronomical called centre Chronometer civil Constellation contains Corr corresponding D's App D's APPARENT ALTITUDE daily declination deduced diff difference directions dist Divide east EFFECT error estimated EXAMPLE feet find the Error fixed Star gaining give given Greenwich Half Sum height horary angle horizon horizontal parallax index error June Latitude less letter LOGARITHMS Longitude lower limb March mean meridian method minutes Moon's Names Nautical Almanac nearest nearly necessary noon North object observed altitude passing Planet polar distance Pole Star proper PROPORTIONAL LOGARITHMS reduced right ascension RULE Scale Second CORRECTIONS semidiameter Ship slow for mean Star's subtracted Sun's Sun's Apparent Altitude Table taken telescope THIRD CORRECTION true altitude tude variation watch

### Popular passages

Page 44 - C, as seen above, are constants, depending upon the latitude of the place of observation and the declination of the star. Tables for these quantities will be found in an appendix to Annual Report US Coast and Geodetic Survey for 1874.

Page 36 - When there is a good opportunity for observing the distance between the Sun and Moon, or between the Moon and a Star...

Page 5 - ... will be the right ascension of the meridian. From the right ascension of the meridian (increased by 24 hours if necessary) subtract the sun's right ascension...

Page 17 - Subtract the true altitude of the sun's centre from 90°, and the remainder will be the sun's true meridian zenith distance, which is to be called north or south according as the observer is north or south of the sun at the time of observation.

Page 12 - The Hare The Great Dog The Little Dog The Ship The Hydra The Cup The Crow The Centaur The Wolf The Altar The Southern Crown The Southern Fish Cuntellatnm.

Page 8 - ... distance of a heavenly body from the moon. 1. Under the given distance put down the two computed distances of the same heavenly body found in the Nautical Almanac between which the given true distance lies. 2. Take the difference between the first and second, and also between the second and the third. 3. From the proportional logarithm of the first difference subtract the proportional logarithm of the second difference, the sum is the proportional logarithm of the additional time to be added...

Page 19 - For finding the Latitude by an Altitude of the Polar Star. This table is to be entered with the right ascension of the meridian at the time of observation ; the correction corresponding to which being added to, or subtracted from, the true altitude of the Polar Star, as denoted by the sign + or —, the sum or remainder will give the latitude of the place of observation, which is always North. The table is calculated particularly for the years...

Page 16 - Benetnach, the Star in the point of the tail of the Great Bear, and Deneb, in the tail of the Lion, is a.

Page 18 - ... to be on the meridian below the pole ; if the altitude be then taken, the latitude may thence be found as follows : — RULE. Correct the...