818 ‘ 
TAB DE U 
| | | RER Ak ad | 
Year Bare Ln | La | | ld je | oe | 160 | Newc. | 
1703.0 | (001 || 628 — 3.9154 
I — 7.5 | +1889} --103% 756 
1721.0 | | | 0 0 0|— 0.4 
| II == 2,3 | 282180 20 naib | | 
1739.1 je | | — 647 | + 690 |+ 4.3 + 4.6 
| 1) * = fon 2200 Lang =op | 
| 1757.1 | | | BTB 11414 |. 8.8) ERO 
| IV | —16.9 | +2197 | —246 | —3u8 | 
| 1775.1 | — O11 | 41954 4.12.2 |e ie 
| V eH. 8. | Seats 80 | | | 
1793.1 | | 072" 42084: 413: 02E 1388 
| ER SNE re | | 
| 1811-2 | — 940 | +1925 |H12.0| 411.71 
| Ln (E15 ee Be | 
| 1829.2 | — 862 | +1430 |+ 8.9 + 8.7 
| VIM gid. | 2627 30°} 32 | | 
|-1847.2 | | | | 542 | 785 | 5/0 A 
| TK 4 21570 |e 74 NT 202 ERI | | | 
1865.3 | | 8 NES 0} 
X —14.8 | +3200 | —168 | +605 | 
| 1883.3 e | | | 4. 658 | —1061 |— 6.6) "6m 
| XI |-—21-4 | --8135'| —413 540 | 
| 1901.3 | | | +1086 | - 2734 | —17.1 |--10:2 
XII | — 5.3 | +3269 | +185 | +674 | 
1919.4 | | | +1237 | —5066 | —31.7 
ee aad he ME Kd Je L | | 
We have A,v = — 382, A,4= + 2595. If we neglect the term 
in p*?, and choose the values of A}, and v, so as to make Ap = 0 
for 1721 and 1865, the perturbation in longitude given under the 
heading A, results. If we add the term 4 p?A,v, at the same time 
altering the initial constants so that the perturbation remains zero 
at the same two epochs, we get the values 4, '). 
The reliability of these results of course depends on the reliability 
of the individual values of dn. The values of /, in two successive 
eclipses differ by 155°, consequently the values of dn have opposite 
signs and nearly destroy each other. Therefore, to arrive at a toler- 
able accuracy in the final perturbation in longitude, it is necessary 
to compute the individual dr to a much higher aceuracy. The sum 
of the neglected terms in the series (9) will generally not exceed 
Leo, OF in some cases perhaps *‘/,,., of the whole. The maximum 
value of dn is about 190, we may thus expect on this account an 
error of one, or in extreme cases, 2 units. | 
The chief source of uncertainty is the function ./,. This function 
contains the hypothesis regarding the distribution of mass in the 
1) In the original Dutch there was a mistake in the values of a, and Ag, which 
has here been corrected. The conclusions remain the same, 
