386 



Art, XIII. — Results of some Astronomical Observations made in 

 Blackman-Street, during the Months of March, April, and 

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

 Longitude 21".76 W. 



Eclipses of Jupiter^s Satellites. 

 (Mean Time.) 



h. , ,, 



March 1, Emersion of 1st Sat. at 6 57 36.60 ) ... C 5 feet Equatorial 

 6 57 43.60 ) ( 30 inch Gregorian. 



Diameter of Venus taken in the direction of her Cusps, at about 

 tiuo o'clock, p. M. 



March 3, The planet distant from ? g ^ I i- I lo measares= 59.936 

 her lufenor conjunction J I S I 



Occultations of Fixed Stars by the Moon's dark Limb. 



No tremulous appearance of either of these Stars, no projection of either 

 of them upon the moon's disk — the disappearance of all instantaneous. 



An object glass, 3i inches in diameter, and of 45 inches focal length, 

 having been made for me by Tulley, from formulx given by Mr. Herschel, 

 in a paper recently published in tlie Philosophical Trayisactiotis, it became a 

 matter of much interest to ascertain what merit it might possess ; and for 

 this purpose it was directed to some of those double stars in which proxi- 

 mity or faintncss renders one of them difficult to be seen, and the accom- 

 panying diagraiiis, plate V., are faithful representations of the results : what, 

 therefore, ftlr. Hcrschel's theory told him would be good, Mr. Tulley's 

 practice has declared so. The magnifying power employed upon the stars 

 was about 300 — npon the Nebula about 50. 



At the request of several astronomical friends, the corrections in right 

 ascension of the thirty-six principal stars are here resumed ; and tables for 

 converting space into time and the contrary, are subjoined for the con- 

 venience of the practical astronomer. 



