209 



Art. XVIII. Results of sojne Astronomical Observations made in 

 Blackman- Street, duriiig the Months of January and February, 

 1822, by James South, F.R.S., in Latitude 51° 30' 3" N., 

 Longitude 2r'.8 W. 



Eclipses of Jupiter's Satellites. 

 (Mean Time.) 



Jan. 14, Emersion of 1st Sat. at 



29, 

 Feb. 23, 



2d 

 3d 



6 23 4i).48 

 6 23 57.4s 



6 55 45 30 



7 8 26.90 



with 



r5 feet Equatorial 

 J 30 incli Gregorian 

 ] 5 feet Equatorial 

 1 5 feet Equatorial 



Occultations of Fixed Stars by the Moon. 



Staj's AR. 



Feb. 28, 



4 40 30± 



Star's Declin. 



26 54 30 i- N 



A double Star of the 5th 

 class, large red, small blue 



Mag. 



Time of im- 

 mersion (in 

 Sidereal time. 



Jan. 1. With 5 feet Equatorial. 



I 12 30± 11 40 ± N 7,8 21 44.40 ^ 30 iucli Gregorian. 



21 44.40 "2 No tremulous motion of tlie 

 Star, no projection of it on 

 the P 's disk ; its occnltation 

 instantaneous ; the observa- 

 tion accurate to one tenth 

 of a second. 

 6 7 ;!8 52 67 "^ With 5 feet Equatorial, 

 jr 9 36 23.23 ^ Small blue Star! „i,|, t 

 '9 36 58-73 Large red Star j in. cregori 

 9 36 58.73 ditto witli the 5 feet 



Equatorial 



No tremulous motion of either of these Stars, nor any projection of either 

 upon the J 's disk, their disajipearance instantaneous. 



Diameter of Mercury, taken in the direction of his Cusps. 



Feb. 14, The planet distant from ] 

 his greatest elongation ' 



15, 



16, 



= 6.474 

 = 5.912 



= 6.148 



Diameters of Venus taken in the direction of her Cusps. 



') ) = 46.224 



Feb. 10, The planet distant from 

 her inferior conjunction 



14, -i' 



15, 



28 



27 days 



23 days 



22 days 



9 days 



= 48.781 

 = 49. 647 

 = 59656 



These measures of Venus, as also those of Mercury, were taken 

 by day-light, and from one to three o'Clock, P. M. 



Observations of the Shadows oftzvo of Jupiter's Satellites, seen on 

 the planet's disk in the day-time. 



Feb, 14. At 2* 1' sidereal time, or about 4* 26' mean time, 

 I saw very distinctly the shadow of one of Jupiter's satellites 

 upon his disk. At 2* 12' a satellite came ofFhis face, and con- 



VOL. XIII. P 



