: I
I i
I' i f.
I' 'ri
San Francisco, th e difference agrees with th e difference o f longitude 81' 21" measured backwa
rd an d forward b y chronometer. I t will be proper, therefore, to consider the
0 I II I II 0 I II
Longitudeof Monterey Observatory, 122 23 07 — 31 21 = 121 5 1 46
which is within 1' 06" of tlie corresponding observation.
Monterey Fort Latitude, 36" 36' 24" N. Longitude, 121° 5 1' 46" W .
COQUIMBO.
Observatory 10" N. o f the Copper Foimde ry.
1000 TIT • . LONGITUDE.
1828. Moons transit o 1 11
May 28. compared with J Ophiuchi, 71 15 30 YV.
...................................... «Scorpionis, 16 52
31.................................« “Capricorni, ( 1^30
5 16 5 2 * Greenwich.
LATITUDE.
Mean 9 meridian al- Ì
titudes 0 and » J
Difference, . + 10
56 47 S.
Mean, . n m « ' y . ¡ 9 36 67 S .
Copper Foundery Latitude, 29- 5e ' 57" S. Longitude, 7 1 " 16' 1 1 " W.
CHAMISSO ISLAND.
T lie lo ngitude o f this island was determined b y lu n a r observations.
1826. © a n d * E. and W ..........................................................
1827. 46 sets E. and YV. . . . . .
Mean,
IS26. Lieutenant YVainwright, 28 sets, © E. . . . . ig l 44
1827. Ditto ditto 20 sets, E. and YV.
Latitude by mean o f many meridian ;
, ®, with artificial horizon,
do. do. Lieutenant Belcher,
do. do. Lieutenant YVainwright,
. 161 43 45 YV.
45 56
161 45 50.5 YV.
44 03
42 24
66 13 1 1N.
13 12
13 10
Latitude o fth e summit of Chamisso Island, 66“ 13' 11" N. Longitude, 161“ 45' 50" YV.
T h e chronometrical measurements between San Francisco and Chamisso agree very
nearly with this determination o f th e longitude by lunar.
In 1826 the diffeience was . . . . 3 9 23 33
1 8 2 7 , 39 26 12
Mean, . . 39 24 57
Longitude, San Francisco, . 122 23 07
Longitude, Chamisso Island, 161 48 04 YV.
By lunars. 161 45 50 YV.
. m m W
PETROPAULSKI.
I regret very much tliat circumstances prevented my observatory being erected at this
place, as the lunar observations of the diffei-ent officers of the ship vary in an extraordinary
manner ; and unfortunately Mr. Preuss, the astronomer who accompanied Captain Kotzebue,
obtained at this place two results differing ten miles, each of which coincides with the extremes
of the longitudes detei-mined by our own observations.
Thus, tbe mean of lunar observations by myself, © and * E . and YV., in 1826, 210 10 44 YV.
tlo- by Lieutenant Belcher, 1896, . . 201 12 52 YV.
Mean, . . . 201 11 48YV.
Mr. Preuss, by eclipse of tlie sun, 25th June, 1824, Còl J l 24 YV.
Lunar observations by Lieutenant YVainwright, © E., in 182fi, . .' ! 201 22 45 Yv!
cbtto E. and YV., in 1827, . . 22 18
Ditto by Mr. YVolfe, 0 E., . . . . / . . J5
Mean, . . . . 201 22 06
Mean of culmination of the moon by M r. P reuss*, . 201 19 50 YV.
Emersion, 1st satellite, in 1827, by myself, . . 201 19 00 YV.
Under these doubtful circumstances I shall deduce the longitude, by chronometer,
from San Francisco in the east and Macao in the west. Between Petropaulski and the former
place the difference of meridians was measured in two successive years, and found to he__
Between San Francisco and a .amisso, | J®® ■ S® 2* S" W.
Between Chamisso and Petropaulski, 39 K ¡ 5 ^ ' ' ' »9 27 09 W.
San Francisco and P e t r o p a u l s k i , Sum, 78 51 59 YV.
Longitude, San F r a n c i s c o , ’ 122 23 07 YV.'
Longitude of P e t r o p a u l s k i , ............................................................ 201 15 06 YV.
Difference of meridians between east end of Kaikong, a t Macao, and Port Lloyd, 28 41 06 E
Between Port Lloyd and Petropaidski, ............................................................. 16 30 12 E
Macao and P e t r o p a u l s k i , ............................................................. 45 1 1 i s E
Longitude, Kaikong ( M a c a o ) , ................................................................................. 246 27 00 YV.
Longitude of Petropaulski, 201 15 42 YV
YYriiicli agrees nearly witli that deduced from San Francisco.
The results will now bo as follows :
Longitude by lunar o b s e r v a t i o n s , ................................................................................ 201 11 48
Ditto ditto 201 22 06
Mean = 201 16 27 YV.
by chronometer from San Francisco, 201 15 06
^ r. 201 15 42
Eclipse 1st Satellite, 19 oo
Culmination moon do. by Mr. Preuss, . . . . 201 11 24
Eclipse © do. do............................................................................................ 20I 19 50
Tlie latitude of the church at Petropaulski i s ................................................... 53 00 58 N.
by Lieutenant YVainwright, 00 29 N
Mr. Y V o l f e , 00 35 N.’
• jYIr. F . Baily has clone me the favour to examine Professor Struve’s remarks on Mr. Preuss’s observadons, anti concludes
by giving die preference to the results by culmination of the moon 5 Professor Struve having recomputed them witli
very great care.