Clock time at the transit, U.... 
Clock correction, du 
SIGerenl MIE LE a AN RUE 3 28 13.26 | 345 30.38 | 9 | 3 17 31.18 | 350 
Approximate long., In.......2.. +1 14 50 |+1 14 50 | 
Sidereal time at Grw. mean noon. | 12 12 37.16 | 12 12 37.16 | 
124 I. P. Koch. 
The Moon f Tauri 
Telesc. east Telesc. west | Telesc. east | Telesc. west 
| 
| 
| a | 
Sidereal time at Grw, .......... | 443 03.26 | 5 00 20.38 | Е | 87093.23 |-- 8m43s.49 
t 
Interval in sidereal time........ | 16 30 26.10 | 16 47 43.22 | 
Converted to mean solar time .. | 16 27 43.84 | 16 44 58.13 | 
(= 16h27m.7307 — 16h44m,9688 
From the Nautical Almanac is taken the variation in 1" mean 
time for «€ and dC that is 
at mean time 16h Да < = 25.0803 Д9< = 8.968 
en 17h — = 90310  — == 8.888 , of wh 
= on a WP (221 2 8.980 
ar 16h on 2 
oe 
From the Nautical Almanac as well as from Greenwich Obser- 
vations 1907”) we get 
2 at Ah са ще. SUSAN GEOG SP eee eee 3134m] 68.05 
Interpolation 2.0805 >< 27.7307....... + 57.69 2.0806 x 44.9688 +1 33.56 
Corr. after Greenw. Observations 1907 Be! 0.25 de SP 6 MSN je 0.25 
а at the moment of observation .. 3h35m13s.99 3h35m49s 84 
(Gates mean time. о 1425045408 с a eee 14°56'45".0 
Interpolation 8.950 >< 27.7307........ + 408.2 8.938 >< 44.9688 + 641.9 
Corr. after Greenw. Observations 1907 +. 0.4 male Sh eee Pde 0.4 
$ (< at the moment of observation . . 15°00’53”.6 15032463 
The moon’s semi-diameter $ € and horizontal parallax л <. 
As the Nautical Almanac only quotes these quantities for mean 
noon and mean midnight, it is necessary to compute them for the 
observation moments by interpolation with the second differences. 
The following interpolation formulæ have been used: 
n n(n—1) du; + du, 
an) = п = Чиа, + — Le - 
fl n) Se Dat 1x2 2 
The meaning of the individual quantities of the formula is: 
Argument Function Ist diff. 24 diff. 
A-_ U- 
| À i : A п. 1/5 9 
ao ug 47 uo 
an — dur, 
a+4 meg du: 
+ + dus, + 
a+ 2 U 2 
1) Astronomical and Magnetical and Meteorological Observations made at the 
Royal Observatory, Greenwich, in the year 1907. Edinburgh 1909. 
2h08m31s.72| 2h25m485.84 | U | 1h57m55s,64| 2h]4m48s,36 
EL I +1 19 41.54 +1 19 41.54 | du |+1 19 41.54 +1 29 41.54 
3 25 4641 | 3 25 46.41 
|-- 2°02’ 18”.4 |+ 2010’ 524 
