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Solar eclipse of April 25, 1845.

Ans. The first contact will be at

time of greatest obs.

the final contact at
Digits eclipsed

11h 14m 26.7 A. M. Camb. m. s. t.

0 33 15.5 P. M.

1 52 15.8 P. M.

6° 38′ on the sun's south limb.

15. Calculate the solar eclipse of April 25, 1846, for the High School Observatory of Philadelphia, for New York City Hall, Boston State House, and the Greenwich Observatory.

The latitudes and longitudes of these places are as follows:

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Long. in time.

h m 8

Long. in arc.

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6 53 56.7 3 23

Greenw. Obs. 531 41.2 P.M. 6 13 42.0

16. The first contact in the solar eclipse of December 9, 1844, was observed at New York, by Professor Loomis, at 3h 34 8.6 mean solar time. Calculate the corresponding longitude of Columbia College, New York.

Solar eclipse of April 25, 1846.

The time of first contact in this eclipse was observed, altogether independently of each other, by Mr. W. C. Bond, the director of the Cambridge Observatory, Major J. D. Graham, of the United States Corps of Topographical Engineers, and Mr. George P. Bond; and the mean of their observations agrees almost precisely with the places of the moon computed by Lieut. C. H. Davis, of the United States Navy, from Damoiseau's tables. His computations, combined with the ephemeris of the sun from the Nautical Almanac, give for 8h 30m 13.1 Greenwich mean solar time,

D= 21° 42′ 52".3 S. N. Y. h 55° 0′34′′

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17. The final contact, in the solar eclipse of December 9, 1844, was observed by Professor Barnard, of the University of Alabama at Tuscaloosa, at 3h 35m 30.6 mean solar time of place. Calculate the corresponding longitude of this University.

The latitude of Tuscaloosa = 33° 12'

= 5h

The supposed longitude of the place of observation 5 49m 458 W.

The ephemeris of the sun and moon from Lieut. Davis and the Nautical Almanac, give, for 9h 35m 15.6 Greenwich mean solar time,

D21° 42' 42.7 S.

Tuscaloosa h = 57° 9' 4" d22 54 55 .8 R = 3575.8 D1 = 28′′.1 and the other elements the same as in the preceding example.

1

Ans. 5h 49m 478.8.

Solar eclipse of April 25, 1846.

18. The immersion of y was observed by Mr. W. C. Bond, at his Observatory in Dorchester, on the 5th of February, 1831, at 7h3m 13.0 mean solar time of place. Find the corresponding longitude.

In this case, at the Greenwich time of 23h 47m 30o.3. Greenw.h=79° 52′ 12′′ D=13°28′16′′ S. d-14° 13' 3".0 S. R=1334".5 D1=42".0 P=3253".0

R1=1770".0

1

1

Ans. 444m 17'.6

19. The immersion of 4, 8 was observed by Mr. W. C. Bond, at his Observatory in Dorchester, on the 19th of February, 1831, at 7h 31m 16.1 mean solar time. Find the corresponding longitude.

In this case, at the Greenwich time of 12h 15m 33.4 Greenw.h=88°23′49′′ D=16°4′12′′.4 N. d=15°34′38′′.7 N. R=182".0 R1=2166′′.5 D1= R, 2166".5 D, 376".5 P=3546".0 Ans. 4 44m 19′,5,

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