Conj. at Paris by the combination of the beginning and end of the eclipse. Palermo, (beginning, apparent time. Zend. Conjunction at Paris Conjunction at Palermo. Correction of C's latitude Petersburg S 1h 38′ 45′′,5 Sapparent time, beginning of the eclipse. end of the eclipse. = 00 09 Oh 54' 38",5 2 10 17, 0 3 59 20, 4 18 45 0 54 39, 5 = 1 -44' 06" By the combination of the beginning and end, conjunction in mean time h By the observations of Greenwich, conj. at Paris-0 54 37,5 correction of C's lat. +11,5 Conjunction at Paris, mean time. Correction of C's longitude by the new tables. Observations at Cambridge, New England. Horary relative motion in longitude between the formation of the Between the end of the eclipse and the conjunction. Results: difference of semidiameter between the formation and the breaking of the annular, by observation. 1′ 02′′,10+1' 01",83 Correction of the difference of semidiameters by the tables. Correction of the sum of semidiameters. 27′ 45′′,8 27 45,2 61,45 61,96 -00,51 4,40 h With the corrections-0",5 for the difference of semidiameters and-4",4 for the sum of semidiameters, according to the results of the observations at Cambridge, we have the following results :— Conj. by the formation of the annulus. Mean time. By the end of the eclipse. 19h 44' 37" 19 44 38 19 44 38 = 5 19h 44′ 37′′,6. 10 01, 4 Longitude of Philadelphia west from Paris. Observations at George Town, Maryland. By the breaking of ditto. Longitude of George Town west from Paris. 19 37.00 = 19h 36′ 58′′,5 5 17 40, 5 Note. I have subtracted 1' of time from the formation and the breaking of the annulus, from the observations at Philadelphia, and added 1′ of time to the formation of the annulus at George Town, those errors having been discovered by the result of the observations. By the combination of the observations of the annular eclipse of the sun, April 3, 1791, I have determined the corrections of the Recapitulation of the results of longitudes of Philadelphia and Cam bridge W. from Paris. Notes; with corrections, to be applied to the geographical situation's "inserted from page 158 to page 164, in the first part of the present volume of Transactions, by J. J. de Ferrer. NOTE I. Read December 2d, 1808. THE Longitude of New York (page 297) deduced from the solar eclipse, observed at Kinderhook, and thence transferred by chronometer, is to the west of Paris 5° 05′ 23′′; and by observations of the solar eclipse the 26th of June 1805, at Lancaster and New York, the result gave the longitude of New York to the eastward of Lancaster (page 296) 9′ 16′′ in time. Lancaster west of Paris, (page 297) Hence New York west of Paris (5h 14′ 41′′—9′ 16′′) By the mean result, New York New York west of Greenwich In page 158. Correction of longitude to be applied to the places in page 158. h 5 14 41 5 05 25 5 05 24 9 21 4 56 03-74° 00′ 45′′ 74 07 45 -00 07 00 Thus from the twelve longitudes on the coast, north of Cape May, to New York, subtract 7′ 00′′ of degree; as the longitudes of those points were transferred by a chronometer from the longitude of New York. Occultation of stars by the moon, observed at New York. 1805. May 2. Immersion of a star of the seventh magnitude in I July 8. do. 1806. April 26. do. Septr. 28. do. A Ophiuchus d Geminorum. a star of the sixth magnitude in Ophiuchus h 10 24 25,5 11 55 09,6 8 15 49,3 7 07 10,8 These immersions took place on the dark limb of the moon, and were observed with an achromatic telescope which magnifies 120 times. All the longitudes being transferred from that of Natchez by chronometers, there must therefore be subtracted from each 14" of time. NOTE III. Longitude of La Guira east of Natchez, by correspondent observations of eclipses of the satellites of Jupiter. See the observations of Mr. Ellicott Vol. V. page 189. 1 38 07 To all the longitudes which follow from C. Bueno to Campeche, pages 163 and 164, add 5′ 35′′ of degree, on account of their having been transferred from Havanna, by chronometers; in consequence of the results of the observations, from page 345 to page 357. NOTE V. The longitude of Veracruz, page 160, found by the occultation of o Sagittarius was 6 53′ 42′′,8. I have compared the corresponding observations with the new tables, and have also determined the position of the star from the best catalogues. The result gives, Longitude of Veracruz.. 6h 33′ 52,3 west of Paris, which .96 04 20 Hence to all the longitudes from Veracruz to the Bay (which should be called the shoals) of Gallega, page 164, add 3′ 30′′ of a degree, they having been transferred from Veracruz by triangles. NOTE: VI. From all the longitudes on the Ohio and on the Mississippi (page 159) which are expressed in time, subtract 14" of time, or 3′ 30′′ of a degree, also from the longitudes from the Bar of Santander, to the point on the coast, subtract 3′ 30′′. The whole having been transferred from Natchez by chronometers; from the longitude of which last place, a like deduction or correction is made, as determined from the last solar eclipse. Solar eclipse, June 16th, 1806. After the printing of Nos. XLIII and XLVII, in this Vol. I received the following observations, In page 301, from a communication by Mr. Simeon De Witt, it appears that the total darkness was instantaneous, or, continued but a moment, In latitude 43° 22′ and longitude east of New York. do. west of ditto. 00° 45′ 00′′ 00 14.00 These last observations are the most important to determine the latitude of the moon, and the difference of the semidiameters. It may also be noted that though the total darkness should not have been instantaneous, but even of a quarter of a minute's continuance, yet this influence on the result would have been insensible, or not amounting to a single second. The calculation being applied, it results, that the moment of total darkness was, do. In latitude 43° 22′ and longitude 45′ east of New York at 11h 14′ 07′′ mean time, 11 07 17 + 3,3 |