Gr. m. s. t. of begin. 4'37m22.3 t2=4"52.3=292o.3 2.46574

A repetition of the calculation for 4437′′303, gives t2=—6o.5,
whence Greenw. m. s. t. of beg. of total eclipse=437233.5
longitude 5 20 0

local mean s. time of beg. of total eclipse=11'17TM23′.5

Solar eclipse of April 25, 1846.

For the end of the total eclipse.

The calculation for 4" 37" 30s gives

t2 = 43.7
whence Greenw. m. s. t. of end of total eclipse=4h 38m 138.7

A repetition of the calculation for 4" 38" 15" gives t2= 0
whence Gr. m. s. time of end of total eclipse 4 38m 15.0
longitude 5 20 0

local m. s. time of end of total eclipse=11h 18m 15 ̊.0

7. On the 19th day of February, 1831, an immersion of
Aldebaran was observed by Mr. W. C. Bond, at his obser-
vatory in Dorchester, at 11 43m 37s Dorchester mean solar
time. Find the longitude of his observatory.

Solution.

true lat. 42° 19' 10" Dorch. m. s. time 11h 43m 378

Correcting the tables by means of the Greenwich obser-
vations, and computing the parallaxes, as before, we find

8. If the preceding longitude had been observed with a
chronometer brought from a place whose longitude was
known, and which gave for the Greenwich time of observa-
tion 16 27 54'.3, what would be the longitude?

longitude = 4 44TM 12o.8 W. corr. of long.=-4.5 0.65347

9. To find when and where the different phases of the
eclipse of October 19, 1846, begin and end upon the earth.

For this eclipse the Nautical Almanac gives

Greenwich mean time of 6 in R. A. = 19h 50m 123.2

Solar eclipse of April 25, 1846.

Ans. The eclipse begins at

16h 46m.7 Gr. m. s. t., in long. 16° 21' E., and lat. 9° 50′ N.
central eclipse begins at

17h 52.0 Gr. m. s. t., in long. 0° 32′ W., and lat. 6° 44′ N.
central eclipse ends at

21 38.9 Gr. m. s. t., in long. 126° 5′ E., and lat. 23° 51′ S.
eclipse ends at

22h 44m.1 Gr. m. s. t., in long. 109° 6′ E., and lat. 20° 47′ S.

10. Find when and where the eclipse of October 19, 1846,
is central at noon.

Ans. At 19 50m 2 Greenwich mean solar time., in long.
58° 41′ E., and latitude 19° 22′ S.

11. Find where the eclipse of April 25, 1846, begins in
the horiozn at the Greenwich mean time of 4".

Ans. In latitude 28° 42′ N., and longitude 147° 50′ W.
and in latitude 9 34 S., and longitude 148 13 W.

12. Find the place of the southern limit of the eclipse of
April 25, 1846, which corresponds to the Greenwich mean
time of 4".

Ans. Latitude 13° 39′ S.
longitude 81 35 W.

13. Find where the solar eclipse of April 25, 1846, is
central for the Greenwich mean time of 5.

Ans. Latitude 25° 52′ N.

longitude 73 11 W.

14. Calculate the solar eclipse of April 25, 1846, for the

Cambridge observatory.