564 
A «2 = — 446™ Ay=-+ 355™’) 
or expressed in seconds of longitude and latitude : 
AD =1555. West Ap = 11"; North: 
For the determination of the relative situation of the observation- 
station Mecca and the Kabah we have a report of Mr. Sarim that 
the latter is at 187 steps 5.S.W. of the former. After this indication 
it has been tried to identify the observation-spot in the plan of 
Mecca by BurckHARDT, as revised by Snouck Hureronse, of which the 
scale has been given in steps. As the most likely place we have 
found the spot indicated on Plate H, Fig. 2, as point II, which is 
situated at a distance of 192 steps from the Kabah, indicated as 
point I, in a direction 13° East of the North. 
The rectangular co-ordinates of the observation-station relative 
to the Kabah thus are: 
Ax=-+ 35™ Ay=-+ 144" 
or AA = 12 ast A@=4" 7 North 
As regards the mean errors of the values for A2 and Ag, I 
believe that they are not undervalued if we adopt + 2".5 for both 
co-ordinates for Jidda and + 1".5 for Mecca. 
So we obtain : 
Latitude Jidda Mecca-gate 21° 29'5"5 + 2'7 , 
Latitude Mecca Ka’ bah 21° 25'18!4 + 2"1 
Difference of longitude 38 244 + 4'4 — 2n 33°63 + 0:29 
The thus obtained latitude may be compared with the result found 
in 1876 by Comm. Wuarton, on which the Adm. chart is based. 
The point determined by him is situated on Geziret el Mifsaka 
and the latitude he found was + 21°28'0". Further we find by meas- 
urement on the chart that the latitude of the Mecca-gate is 21977 = 
= 1'11".4 greater. Hence it becomes 21°29'11"4 i. e. 6” greater than 
the value found by us, an agreement which, if we take into account 
the reductions that had to be added to both results before their 
comparison, may be considered satisfactory. 
In the second place Wuarton’s result for the longitude of Jidda 
may be employed to determine the longitude of Mecca from the 
meridian of Greenwich. He found as longitude of his observation- 
spot 39°11'25"; according to the chart the Mecca-gate is situated 
1) These resulls may be compared with the co-ordinates of the English consulate, 
which is next to the Dutch, measured on the adwiralty-chart, as accurately as was 
possible: : Ax = — 542m ny =-+ 344m, 
Our plate Il, fig. 1 is based solely on Mr. Satim’s measurements. 
