198 
PROCEEDINGS OE SECTION A. 
LONGITUDE DETERMINATIONS IN AUSTRALIA, BY LUNAR 
OBSERVATION'S. 
Dr. Auwers’ investigation and discussion of these observations 
produces the following results, based on — 
1st. Observations of moon culminations observed by the Rev. 
Dr. Scott, then Government Astronomer at the Sydney Observatory, 
in the years 1859-60, &c. 
2nd. By observations of moon culminations made by Mr. H. C. 
Bussell (now Government Astronomer at Sydney) in 1863-71-74, &c. 
3rd. By observations of moon culminations made at Williams- 
town under the direction of Mr. Ellery, Government Astronomer of 
Yictoria, in 1860-62. 
4tb. By observations of moon culminations made at Melbourne 
by Mr. E. J. White, chief assistant, under the direction of Mr. Ellery, 
in 1874-75. 
5th. By observations of lunar occupations made by Mr. E. J. 
White, under Mr. Ellery's direction, at the Melbourne Observatory, in 
the years 1874-75. 
6th. By observations of lunar occupations made by Mr. John 
Tebbutt at his private observatory, Windsor, New South Wales, in 
the years 1873-74-75-76, &c. 
Dr. Auwers reduced all these observations to the longitude of 
Sydney by adopting the telegraphic values of the intervals Sydney- 
Windsor as 1 min. 28*83 sec., and Sydney-Melbourne as 24 min. 
55*43 sec. ; and found — (3) page 345 : — b m sec 
Longitude of Sydney Observatory ... ... ... 10 04 49*60 
„ Melbourne Observatory ... 9 39 54*17 
,, Windsor (Mr. Tebbutt’s Observatory) 10 03 20*77 
We have seen that, on the strength of later determinations, the 
intervals Sydney- Windsor and Sydney-Melbourne are, respectively : — 
Dr. Auwers’ 
folio WB, viz : — 
h, 
0 
0 
results 
in. 
1 
24 
sec. 
29*43- 
55*40- 
-(16) page 313. 
-(3) page 24. 
must therefore be slightly 
h. 
Longitude of Sydney by moon culminations — Scott 10 
Longitude of Sydney by moon culminations — 10 
Bussell - — 
Longitude of Sydney by moonculminations — Mean 10 
Longitude of Melbourne by moon culminations at 10 
Williamstown and Melbourne-}- 24 min. 
55*40 sec. 
Longitude of Sydney by moon culminations, 
!{(i.) + ('i-)} 
Longitude of Windsor by lunar occupations ob- 
served by Mr. Tebbutt 4-1 min. 29*43 sec., 
with weight 5 
Longitude of Melbourne by lunar occupations ob- 
served by Mr. White + 24 min. 55*40 sec., 
with weight 1 
Longitude of Sydney by occupations 
=A{5 (iii.) + (iiii.) } 
modified, as 
m. sec. 
4 45*81 
4 50*66 
48*24 (i.) 
50*08 (ii.) 
10 4 49*16 
10 4 50 68 (iii.) 
10 4 48*52 (iiii.) 
10 4 50*32 
