206 ASTRONOMICAL OBSERVATIONS 



Mean Latitude of Ivy Cottage, 

 Cornbrook, from 164 observa- 

 tions on the Sun, taken in the o / v 

 years 1824, 25, 26, and 27 53 28 2.6 



Ditto from means derived from 

 100 observations on Stars, in the 

 years 1823, 24, 25, 26, and 27. 53 28 1.2 



Mean of the above, or the true 



Latitude of Ivy Cottage 53 28 1.9 



From which the Latitude of St. 

 Mary's spire, Manchester, 

 calculated from the forego- 

 ing observations will be 53 29 4 



The observations that I have made on the 

 EcUpses of Jupiter's Satellites, with a view to 

 ascertain the Longitude, are but few in number, 

 as opportunities but seldom occur when the sky 

 is sufficiently clear, and the eclipse happens at 

 the time the planet is above the horizon. 



I have, for these observations, made use of 

 an achromatic telescope, with an object-glass^ 

 2| inches diameter, and 3^ feet focal length, 

 and a magnifying power of 180 times. 



The time was ascertained, on each of the 

 nights of observation, by some known star^ 

 passing the meridian as near the time of obser- 

 vation as possible. 



