made in the Aufirian Netherlands.. 639 
and compared with a great number of correfponding 
ones, made in different places, to a far greater number, 
which could but be compared with thole of one or two 
aftronomers only. If this conlideration be of the weight 
it appears to me, it has not been fufficiently attended to, 
and I mention it as it may be of ufe, particularly to 
young aftronomers. 
The meridian zenith diftances of the Sun and ftars 
were taken with a quadrant one foot and a half radius 
made by bird, exactly and very fteadily fixed in the 
plane of the meridian. The declinations of the fixed 
ftars, with the equations for aberration and nutation, 
were taken from the Connoijfance des Terns; the Sun’s 
declination from the Nautical Almanac; its parallax and 
refractions, with the corrections for the barometer and 
thermometer, were computed from m aker’s tables pub- 
lifhed by the Board of Longitude.. It may not be im- 
proper to add, that, when I obferved both the upper and 
lower limbs of the Sun upon the meridian, I made the 
horizontal wire of the quadrant merely a tangent to the 
Sun’s limb ; for which reafon its diameter will come out 
by fuch obfervations confiderably greater than it really 
was. 
For the obfervations of Jupiter’s fatellites we ufed a. 
refleCtor two feet and a half focal length, a telefcope by 
SHORT, 
