(Vol. VIII. Part II.— p. 504. J 



Times, 



Altitudes observed, 



8* l'52'.B 



38" 10' 



2)38 04 

 19 02 



Correction for Refr. Parallax, 18 22 i 



True Altitude, - 19 15 22 



CALCULATION FOR THE TIME WITH AND WITHOUT EQUAL ALTITUDES. 



Valenciennes. 

 Mode of deiermining the Time by a Sextant of Tkouchton' 



Longitude East of Paris 4' 44" 

 6 36.S 

 39° 30' 



% 25th September 1817. 

 No. 1200. Valenciennes, 25th September. 



Latitude 50' SI' 15" 

 4 48.3 5 2 



fi 59.3 



38° 40 



— 2'37".4 

 + 15 59-5 



Al- 



i — 2 29.7 

 + 15 59.5 



Very dear. 



39 44 

 19 52 

 + 18 29.8 Serai-dium. Paral. k Refrac. 



20 05 29.8 True Alt. Sun's Centre. 



Sun's declin. corrected, 



Cosine, 



Ar. co. cos. Lax. 



44 30 

 9.0999636 

 0.1951520 



44 S6.6 

 99999635 

 0.1951520 



Sun's declination South, 



Sun's Meridian Altitude, 

 Nat. Sine, 

 Proportional parts for " 



18 54 15 

 627963 

 + 59 Diff, proportional ports, = 23 



Sun's Meridian Altitude, 

 Nat. Sine, 



N. 8bel K tAll.;i9*15'22" 



Difference, 



Prop, parts for " N. sines, 



Log.' 



Ar. co. Sun's decl. — a 



The 23 Proportional Parts for difference of Sun's declination to be equally distributed from first to. last Observatioi 



295474 

 9.4705194 

 0.1951884 



294097 292721 291344 



9.466490G 9.4664589 9.4644662 



0.1951884 0.1951884 0.1951844 



289970 

 9.4623531 

 0.1951885 



287223 

 3.4582193 

 fl.1951885 



285848 

 9.4561352 



0.1951885 



628022.... 1 

 629691 



628020 

 SS106S 



628017 

 332436 



628015 

 333807 



628013 

 335178 



628010 

 336548 



628008 

 337917 



628006 

 339285 



428004 

 340653 



628001 

 342020 



627999 

 343386 



298331 

 100 



296957 

 108 



295581 

 107 



294208 

 111 



292835 

 114 



291462 

 118 



£90091 

 121 



2887a 

 125 



H87351 

 128 



285981 

 133 



384613 

 137 



284476 

 9.4540457 

 0.1951885 



590)2503(4 '.2 



Time from Noon, 

 Times of Observation, 

 Chronometer Timci, 



Chronometer — App. Tin 



8 51 17.4 

 8 8 42.6 

 8 1 52.8 



6 49.8 

 49.5 

 49.6 

 48.8 

 49.9 

 50.4 

 49.7 



3 60 42.3 

 8 09 17.7 

 8 2 28.2 



3 50 07.1 

 8 9 52.9 

 S 3 3.3 



6 49.6 





50.1 

 48.9 1 



49.5 







10)6 496.2 





Mean, 



Rale to Noon, 

 Difference of Meridians 

 Reduction of Equation I 



= 6 49.62 



.61 



— .06 



Noon, + 3.25 





App. Noon, 



6 52.20 

 11 53 07.80 by Chronometer. 





3 49 S1.9 

 8 10 28.1 

 8 3 39.3 



6 48.8 



3 48 56.7 

 8 11 3.3 

 8 4 13.4 



8 48 21.3 

 8 11 38.7 

 8 04 48.3 



3 47 46.10 

 8 12 14.0 

 8 5 24.3 



S 47 10.6 

 .8 12 49.4 

 .8 5 59.3 



3 45 59.8 

 8 14 00.2 

 8 7 11.8 



Result of Equal Altitudes observed the same Day with Sextant. 

 54".S 35".3 '20°\3 4".3 



of Equal Altitudes. 



11 53 07.80 Mean of Apparent Noon, by Equal Altitudes. 

 ..11 63 07.80 Simple Altitude with Sextant. 



Sun's Longitude 6-2°0' App. Noon 11*51' 41".7 

 Middle Observations, - - 10x46' A. 



11 52 49.77 Mean-. 



