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II. A partial eclipse of the Sun, May 15th, 1855, invisible at Washington.

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Begins on the earth generally, May 15th, 6h. 54.7m. A. mean time at Washington, in longitude 203° 55′ W. of Washington, and latitude 25° 16′ N. Greatest eclipse at 8h. 53.0m. A. Magnitude (sun's diameter 0.77, in longitude 266° 16′ W. of Washington, and latitude 62° 54′ N. Ends on the earth generally, May 15th, 10h. 51.2m. A., in longitude 37° 14′ W. of Washington, and latitude 59° 56′ N.

This eclipse will be visible in Asia, in part of Europe, and in the northern part of North America.

III. A total eclipse of the moon, October 25th, visible at Washington.

First contact with the shadow, Oct. 25th, 0h. 35.6m. M.
Middle of the eclipse,

Last contact with the shadow,

Mean time at

2 21.0 M.

Washington.

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This eclipse will be visible chiefly in North and South America.
The times of beginning and end are as follows.

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IV. A partial eclipse of the Sun, November 9th, 1855, invisible at Washington.

Begins on the earth generally, November 9th, 0h. 27.Qm. A., mean time at Washington, in longitude 111° 20′ W. of Washington, and latitude 31° 21' S.

Greatest eclipse at 2h. 8.9m. A. Magnitude (sun's diameter

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1) 0.494, in longitude 161° 53′ W. of Washington, and latitude 62° 37′ S. Ends on the earth generally, November 9th, 3h. 50.9m.` A., mean time at Washington, in longitude 280° 24′ W. of Washington, and latitude 68° 52' S.

This eclipse will be visible partially in Australia and in New Zealand.

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OCCULTATIONS.

Elements for facilitating the Calculation of Occultations visible at Washing

ton in 1855.

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A Table showing the Illuminated Portions of the Discs of Venus and Mars.

THE numbers in this table are the versed sines of that portion of the discs which, to an observer on the Earth, will appear to be illuminated, the apparent diameters of the planets at the time being considered as unity.

To a spectator on the Earth, Venus appears most brilliant when her elongation is about 45°, and she is approaching her inferior conjunction, or receding from it; in 1855 in August and November. Mars is most brilliant about the time of his opposition to the Sun, being then also nearest to the Earth; in which position he will not be this year.

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ECLIPSES OF THE SATELLITES OF JUPITER IN 1855,

Visible in the United States between Sunset and Sunrise, Mean Time, Washington Observatory (Astronomical account).

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