1833.] Astronomical Observations at Barelly. 319 
and those in the Berlin Ephemeris differ considerably. With a view 
only to finding difference of longitude between places where the transit 
was observed—this is of no great consequence. The difference of de- 
clination of the Sun and Mercury at 0’ in AR appears to be about 9'2’’ 
.174, and this has been assumed, as also the following quantities : 
Mercury’s Eq. Hor. Parallax, 15".362 Sun’s O° 87.5 
Semidiameter,, 5.75 + 15 52.35 
Mercury’s Hor. Mot. in AR.~118.7in deca. ~1'  8".4 
Bn 6 ditto: . penx eo + 224.5 Sun's, + .0 }, 42.7 
The Semr. of Mercury obtained from the elements in the N. A. is 5.8 
In the Berlin Ephemeris it is given 5.37. The quantity 5.75 has 
been taken as the result of the measurement of the planet’s diameter 
at Geneva, contained in the 3rd No. of the above Journal. 
May. h. ms. 
The internalingress of § observed at Hull, meantime, 4th, 21 2 21 
Add time from conjunction in AR....... 221 9.44 
Micawtme.ot cin AR at Holl... «.. 2.0.5 sos au 4th, 23 23 30.44 
The internal ingress observed at Barelly.. .. .. 5th, 2 20 58 
Add time from conjunction in AR........ 2 21 34.22 
Mean time of d in AR at Barelly.............. 5th, 4 42 32.22 
The internal ingress observed at Chupra........ 5th, 2 4218 
mocetiune; trom Gi ler... 2 ee eee een 2 21 39.286 
Mean time of ¢ in AR at Chupra...... ...... 5the 15°13 57.286 
The external ingress observed in Calcutta.. .... 5th, 2 53 24.2 
eile) time: from, 6) WAS os oso pw coe 2 24 58.38 
Miremitme of © at Caleutia.......-..-.0.0 200. 5 18 22.58 
Deducting | m. 21 sec. the longitude of Hull from the respective . 
differences, the following longitudes from Greenwich result : 
h. m. s. 
Barelly.. 5 17 40.78 
Chupra... 5 39 5.85 
Calcutta. 5 53 31.14 (Surveyor General’s Office). 
The observations at the ingress at Geneva are stated to have been 
rather uncertain. The internal ingress gives a wide discrepancy, the 
external ingress gives for the mean time of d in AR May 4th, 23 » 
49 ™ 22* -62—a difference of longitude from Hull 25 ™ 52%° 25m 
525-18, or from Greenwich 24 ™ 31° ‘18. The longitude of the ob- 
servatory at Geneva (Gautier’s) is given 24™ 35° 
