546 
RESULTS FROM THE DETERMINATIONS OF TIME AT MECCA. 
| Star East | Star West 
esas | — — EW. 
ay aL | TOR. je Meine sE. a TAR, Mean 
1911 | al 42h 
Febr.14 | 20513 | 15553 | 27m17583 || 16506 | 19538 | 27m17572 | + 0511 
45 | 24.72 | 22.43 | 23.57 || 22.04 | 23.87 22.96 | + 0.61 
- 46 || 28-24) 26 400 WEZTET IL Ze-d8 wl) DELE 28.80 | — 1.48 
, 24] 11.89 | 13.10 | 2812.49 || 12.92 | 11.26 | 2811.79 | +0.70 
, 25 | 17.40 | 17.40 17.40 || 46-30 4) 4740 {7,70 So 
17.69 | 18.34 | 18.02 || 18.55 | 18.09 18.32 | — 0.30 
„ 26 | | 21.33 | 22.88 22.10 
ZA 28 <6 | 20.46 | “ 29.04 || 28.85 | 27.86 28.35 | + 0.69 
Mrchi1 | 22.53 | 24.28 | 29 23.41 || 24.60 | 23.63 | 29 24.11 | —0.70 
ede 102 DEE 27.66 || 27.00 | 26.99 27.00 | + 0.66 
„14| 38.92 | 38.22 | 38.57 || 38.71 | 38.44 38.57 0.00 
, 15 | 43.49 | 42.58 | 43.04 || 42.41 | 42.30 42.36 | + 0.68 
6 | 45.881 46:47 | | 46.4801) 47551 | 4542 46.46 | — 0.28 
„ 17| 50.40 | 50.29 | 50.34 || 50.32 | 49.17 49.75 | + 0.59 
| | | 
We must now first compare the results obtained in the two 
positions of the instrument. If the observed corrections of the chrono- 
meter are Af, and the correction of ihe employed zenithpoint is 
designated by AZ, then we find: 
Atr — Atr 
2 
At —Ätp 
2 
in which, if A? is expressed in seconds of time and A Zin seconds 
of arc, the mean value of the factor a is 13.8. 
Leaving out of account the two days on which the zenithpoint 
Eastern star A Z= Ja 
Western star A Z=—a 
had not been determined and reversing the signs for the western 
stars, we find as mean result: 
an aaa 
pe =d 0907 
