140 



M DE Zach*s Aj]ronomicc\l Obfervations, 



iQih March, 1783. 



tal •\ 



The futj's upper limb at the horizontal 

 wire of th^ firft telcfcope on the eaftern 

 fide - - . J 



Sun's upper limb at the fame altitude on 

 the weftern fide of the meridian 



Dividing the fum by 2 



iiun's center x)n the meridian as marked by\ 

 the pendulum c'ock - - J 



Equition of the day 



Clock (lower than equated folar time 



Sun's 

 Altit. 



o / 



3» 30 



Jfl oblerva- 

 tion. 



9 I 56 



H 31 47 



23 o^ 43 



11 46 51I 



12 7 57 



o 21 



Sun's 

 Alt. 



o 



lid obfer- 

 vation. 



h. , ,,. 

 9 13 9 



14 20 33; 



23 33 4^ 

 II 46 51 



^2 7 57 



o 21 



Clock flower than equated folar time 1 9th March 21 6 

 ■ -■ i8th March 19 32 



■.■■■■»M«| , ■ H I III II. Ill I I I 



Retarding of the clock upon 23 h. 58' 8" - I 34 



I obferved too the mid-day at the great gnomon of the ob- 

 servatory, and found at the fame time the meridian line erro- 

 neous by I ^'\ as you will find in the following tables. 



When the center of the fun's 

 image was on the meridian the 

 time pointed by the clock was 



Equations of thofe days 



) 



the 

 17th 

 Mar. 



11 50 50 



12 8 33 



Retarding onequjitcd folar time 17 a"^ 



Retarding the 17th 



Retarding of the clock during thofe 24. hours 



the 

 i8th 



Mar. 



h. 



/ // 



1 1 48 56 



12 8 15 



19 19 



17 43 



36 



the 

 igth 

 Mar. 



the 

 i8th 



h. 



/ /' 



ii 47 3 

 12 7 57 



20 54 

 19 19 



I 35» 



I fixed therefore the retarding of the clock i' ^^^\ 



True 



