M. DE Zach's j^Jir Gnomical Ohfervations. 



J4I 



True mid-day concluded by the fun's correfpon- 1 

 dent altitudes as the clock marked J 



Equation of the mid-day 



Retarding of the clock at the rate of i' 35" "1 

 per 24 hours - - J 



True mid-day the peaduliim clock Ihould 1 



have marked - - - J 



Mid-day concluded at the gnomon of the 1 



obfervatory . - - - J 



Difference, the error of the meridian line 

 or gnomon . - _ 



the 

 18th 



Mar. 



II 48 42 

 - 18 



+ 13 



II 48 37 

 II 48 56 



19 



the 

 19th 

 Mar. 



a 



II 46 51 

 - 18 

 + II 



II 46 44 



II 47 3 



19 



From thence I concluded, 



Mid-day at true folar time 11 59 ^O 

 Mid-day the clock fliould "I ^ 



have marked on the 1 8th J ^ ^1 



Retarding upon true folar 

 Jime 



} 



II 23 



Mid-dayatequatedfolar time 12 8 15 

 Mid-day the clock ftiouldl „ 



have marked on the i8thj ^ ^' 



Retarding upon equated 1 

 folar time - / 



19 38- 



Obfervation^ 



