CATALOGUE. — PRACTICAL ASTRONO-MY. 



349 



Wollastnn on a universal meridian dial, 4. 



Lond. 1793. R. S. 

 Montucla and Hutlon's recreations, 

 Lefrangois on dialling. Journ. polyt, IV. xi, 



261. 

 See Transit Instruments. 



ChronologVj and Calendar. 



Cassini on the calendar. A. P, II. 198, X. 



433, 520. 1701. 367. 11. 105. 

 Eichaud on the calendar of the Siamese. 



A. P. VII. part. 2. iii. 154.* 

 Wallis on altering the calendar. Ph. tr. I699. 



XXI. 343. , 



^ Prefers the Julian reckoning. 



Lord Burleigh and Greaves on the calendar. 



Ph. tr. 1699. XXI. 355, 356, 

 Observations on the calendar. A. P. 1700. 



H. 127. 1703. H. 91. 

 Jackman on the rule for finding, easier. 



Ph. tr. 1704. XXIV. 2123. 

 Newton on a French publication of his chro- 

 nological index. Ph. tr. 1725. XXXIII.. 



315. 

 Halley's defence of Newton's chronolog\', . 



Ph. tr. 1726. XXXIV. 205. 1727. ■ 



XXXV. 296. 

 Sauveiir's perpetual calendar. A. P. 1732. 



H.94. 

 *Lor<l Macclesfield on the solar and lunar 



years. Ph. tr. 1750. 417. 

 Emerson's cyclomatliesis. X. 

 Horsefall;on a chronological question. Ph. 



tr. 1768. 100. 

 Marsden on tlie Hejeru. Ph. tr. 1788. 414. 



The years of the Hcjera are lunar, commencing 1 6 July, 

 622. 



Marsden on the chronology of the Hindoos. 



Ph.tr. 1790.560. 

 Lalande on epacts. A. P. 1789. 95. 

 Lam^therie on the division of time, and on 



a general epoch. Roz. XLIII. 236, 315. 



An epoch from the precession of the equinoxes, 

 Gilchrist on the hours of the Hindoos. 



As. res, V, 81. 

 Wurm on the new French calendar. Hind,' 



Arch. II. 15. 

 Gauss on the computation of easier. Zacm 



Mon. corr. II. 121. 

 Winter on the solar year. Nich. VII. 1 16. 

 Robison's Elements, 



The Egyptians reckoned by years of 365 days: Hippar- 

 chus and Ptolemy employ the same method. In A. D. 

 040, the first day of the Egyptian year, was the first of Janu- 

 ary ; another Egyptian year began 31 December. In the 

 new stile, lO days were omitted in 1 582 ; before this time, . 

 each century contained 36525 days. Robison. 



To find the prime number, sometimes called the solar 

 cycle, add g and divide by 28 ; the indiclion, add 3 and 

 divide by is. Add i to the year and divide by 19, the rs- 

 mainder is the golden number, take 1 from the golden num- 

 ber, multiply by 11, and divide by 30, the remainder is the 

 epact, or the moon's age on the first of January. Lalande, 



In astronomical language, ] Jan. 1805, o'clock A. M. 

 is 1804, Dec. 3ld. 18h. Lichtenbcrg, 



Tnstrumentsfor Observatian: 



Simple Astronomical Quadrants,; See Geo-- 

 metrical Instruments. 



Now seldom used. . 



Buot's azimuthal instrument. Mach. A. I. 



67. 

 Lahire's universal astrolabe. A. P. 1701. 257. 



H. 97. 

 Parent on the astrolabe. A. P. 1702. H. - 



70. 

 Louville's instrument for right ascensions. . 



A. P. 1719. 188. 

 Meynier's instrument for solar altitudes-. A. 



P. 1724. H. 93. Mach. A. IV. 71. 

 Monligny's instrument for marine oteerva- 



tions. Mach. A. V. 57. 

 An instrument for marine observations,-. 



Mach. A. V. 97. 



