By the mean result of three observations for the meridian of Paris, 1 2 22 15 15 - Mean. 3 01 0 3 03 7 3 04 0 h 21 17 41 4 41 18 7 23 37 " E-tang. Ingress for the center of the earth-apparent Ingress-15,8072 P-2,9354 Q Egress ditto. apparent Egress -13,7041 P+8,3865 Q TABLE. - - Paris. +1,716 +4,730-0 41 0 Mess & Delambre 21 17 58 4 41 19 0 0 21 17 58 4 41 19 Island of Leon Messier. 55 34 157 44 100 Bremen. 21 43 37 5 07 15 25 51 21 17 46 Mirapoix. 4 41 24 25 54 Dresden. 22 03 15 5 26 54 45 27 21 17 48 4 41 27 45 32 E. 5,584 +3,216 +1 43 5 Dresden. I-Ingress of the center of Mercury corresponding to the center of appears from the best observations. the earth. E=Egress. L-Longitudes from the meridian of Paris, from the best authorities. I' and E-Ingress and Egress for the meridian of Paris, reduced to the center of the earth. L'-Longitudes resulting from the observations of the ingress and egress, supposing they happened in Paris 21h 17′ 37′′ and 4h 41′ 27′′ as d L-Difference of longitudes of the columns L and L' or errors of the observations in longitudes, supposing the longitudes in the column L to be exact. Egress of Mercury by Mr. Andrew Ellicott, at Millers Place, Egress reduced to the center of the earth-22 42 51 7—13,7041 P+8, 3865 Q=22 42 52 7 Egress observed in Paris. ditto. Longitude of Miller's Place west from Paris. 4 41 27 0 5 58 34 3 Determination of the tabular error in latitude, by observations of distances of limbs, observed at the observatory of the Island of Leon with a heliometre and reduced to the diameter of the sun 31′ 43′′ 6. The observations published in the nautical almanac of the Island of Leon are made before and after the apparent conjunctions.-It is to be observed, that the distance stated 1 38' 16" involves without doubt an error of the press, of 20", which is easily noticed by a comparison with the other distances. To compare the observations with the Tables, I have calculated the following table of the parallaxes of longitude and latitude. 1 These observations are more proper to determine the latitude than the conjunction, on account of being very near the apparent conjunction. Four series of observations (the most to be depended upon) made in the Island of Leon, give the following mean results. Conjunction in the Ecliptic. Longitude 0 34 08 Conjunction in the ecliptic for Paris by the observation of distances. 1 08 10 0 33 52 6" 4 7 0 6 0 6 0 Mr. Messier found the nearest distance of the centers and the diameter of the O The distances of the limbs should have been observed At Berlin the observed nearest distance, corrected from the influence of refraction and parallax, was (Mem. of the R. Academy of Berlin.) 5' 40" 38 By the above data we find the following error of the tables in latitude. Determination of the diameters of the Sun and Mercury, conjunction in the Ecliptic and error of the tables in longitude. -} 9,9971062 =31′ 28′′ 0 = 3 01 1 = 9,74550 Diameter of the sun resulting from above Logarithm= distance of the O at the time? Apogee-distance of the O Apogee diameter of the O, resulting therefrom Time employed by the diameter of Mercury in the ingress and egress. Hence the diam. of reduced to the mean distance of the earth from the 6′′ 2988 Logarithmic distance of Mercury at the conjunction. |