( 401 ) 
~ 
For the time of the observations and the used part of the sextant 
we find: 
Corr. chronometer to mean loc. time + 46m 43s 4 
Indexcorrection sextant — 155 
Corr. for error of graduation + 25" 
Temperature 279 G, 
Barometer 760 m.M. 
Mean loc. time of transit of sun, 7’ 11h56m 13s 
Hour-angle of maximum altitude, 4 — 485 
Declination of the sun for 744, + 17° 44! 43"5 
The separate observations and their results are given in the 
following table, which needs no further comment. 
Limb | Chron. time. | Hour-angle. | Reading Sext. | Latitude. 
l | 10h53m 40s — 15m 45s 1 | 127° 45! 40" — 7° 50' 5/6 
u 54 55 dees Ua 128 54 50 49 53.2 
| 56 14 Jar Vick 127 56 20 49 59.1 
u ir ot 12 23.6 129 2 30 | 50 4.4 
| 57 37.5 ll 47.6 128 W10 50 2.3 
u 58 20 RE Gel 129 7 30 49 45.4 
] Dele ise LO 23x) 128 5 30 I05 5-0 
u 59 40 9 45.1 129: 11420 49 48.8 
l NE Op Hired OR 128 8 50 50 10.3 
u breda 8 18,6 123) - lanes 49 47.7 
Hence: 
Latitude from lower limb — 7° 50! 42 
v w upper limb 49 51.9 
Mean value — 7° 49/5870 
Difference upper limb—lower limb + 12/3 
Examining these results and also those of the 2rd series given below, 
it appears clearly that there is a perceptible constant personal error 
in esteeming the contact of the two images of the sun, and its mean value 
as deduced from the two series is 5.3 If we correct the separate 
results for this amount, we obtain as mean error of a single pointing 
29 
Proceedings Royal Acad. Amsterdam. Vol. IL. 
