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

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### Common terms and phrases

according added alts apparent altitude apparent distance applied astronomical called Chronometer Constellation Corr D's App D's APPARENT ALTITUDE daily decl declination deduced Diff difference directions Dist divide East effect error EXAMPLE figures Fixed Star give given greater Greenwich Half Sum height horary angle incg interval latitude latter less limb LOGARITHMS Long longitude lunar mean meridian method minutes Moon Moon's apparent altitude MOON'S HORIZONTAL PARALLAX natural versed sine Nautical Almanac nearest nearly necessary noon object observed obtained opposite Planet POLAR DISTANCE Pole Problem right ascension RULE Second CORRECTIONS SECOND DIFFERENCE semid semidiameter Sextant ship sidereal slow Star's subtracted Sum and DIFFERENCE Sun's Table taken Telescope THIRD CORRECTION true altitude true distance tude watch West

### Popular passages

Page 56 - 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 178 - The India Directory; Or, Directions for Sailing to and from the East- Indies, China, Australia, and the interjacent Ports of Africa and South America. Compiled chiefly from Original Journals of the Honourable Company's Ships, and from the Observations and Remarks resulting from the Experience of Twenty-one Years in the Navigation of those Seas. By JAMES HORSBURGH, Esq., FRS, &c.

Page 40 - Gamma ; and so on. When the number of stars in a constellation, exceeds the letters in the Greek alphabet, the letters of the Roman alphabet, a, b, c, d, &c. are applied to the remaining stars in the same manner ; and when these are not sufficient, the numbers, 1, 2, 3, 4, 5, &c.

Page 42 - Aries, the Ram ; 2. Taurus, the Bull ; 3. Gemini, the Twins ; 4. Cancer, the Crab ; 5. Leo, the Lion ; 6. Virgo, the Virgin ; 7. Libra, the Balance ; 8. Scorpio, the Scorpion; 9. Sagittarius, the Archer ; 10. Capricornus, the Goat; 11. Aquarius, the Water-bearer ; 12. Pisces, the Fishes.

Page 9 - ... 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 49 - 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 13 - Rule. — Find the latitudes of both places; if both be north, or both south, their difference will be the answer; but if one be north and the other south, their sum will be the answer. Exercise.— What is the difference of lat. between Philadelphia and Petersburg? Ans., 20 degrees. Between Madras and Waterford? Am., 39° 13'.