THE ANTARCTIC MANUAL. 
I. 
ASTRONOMICAL DATA: 
ECLIPSE OF THE SUN; OCCULTATIONS; AND PHOTO- 
METRIC OBSERVATIONS OF JUPITER'S SATELLITES. 
(Communicated by the Superintendent of the ‘ Nautical Almanac.’) 
ECLIPSE OF THE SUN, SEPTEMBER 21, 1903. 
Ty longitude 165° East and latitude 75° South this Eclipse commences 
September 21, at 3h. 36°0m. local mean time at 283° from the 
North point of the sun’s disc towards the East and 116° from the 
vertex towards the East, and ends at 5h. 33:7m. at 114° from 
the North point towards the East and 309° from the vertex towards 
the East. The magnitude of the Eclipse at the greatest phase 
is 0°903. 
For any position not far from the above, the East longitude of 
which is X and geocentric latitude J, the Greenwich time ¢ of com- 
mencement of the Eclipse may be found from the following formule 
(South latitude to be taken as negative) :— 
Cos w= —1°66173 — [024229] sin 1+[9-78343] cos / cos (A— 20° 4/4) 
t=16h.37 m.51s. —[3°56147]sin w —[3°34482]sin/ —[3-80377 ] cos] cos (A — 18° 57'-0) 
Contact on sun’s limb, — w + 19° 10':0 from the North point towards 
the East, and the Greenwich time ¢ of ending from 
Cos w= —1°65131—[0°24428] sin+[9- 76048] cos J cos (A-+9° 27'°1) 
t=16h. 38m. 8s, +[3-53870]sin w —[3-29917]gin/—[3-78298] cos/.cos(A-+9° 221) 
B 
