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ECLIPSES OF THE SUN AND MOON IN 1831.

There will be two eclipses of the Sun, viz. on the 12th of February and 7th of August. The former will be annular, and the latter total.

There will be two eclipses of the Moon also, both partial; viz. on the 26th of February and 23d of August.

I. Annular eclipse of the Sun on Saturday, February 12th, visible throughout the United States.

[In the computation of this eclipse, Carlini's tables, corrected by the formulæ of Professor Bessel, were used for the Solar elements, and the tables of Damoiseau for the elements of the Moon. Damoiseau's tables were preferred to those of Burckhardt and Burg, not only from the circumstance that they are of later date, but because the apparent latitude of the Moon in this eclipse, deduced from these tables, is very nearly the mean of that deduced from the other two, as will be seen by turning to the phases of the eclipse at Nantucket, Halifax, and Boston; the difference, however, between them amounts to a very few seconds only, especially in the longitude. The elements of the eclipse, as given by these tables respectively, will be found in the Appendix to this part. They were computed twice with great care, for February 12th, 2d, 3d, 4th, 5th, 6th, 7th, and 8th hours, for the meridian of Paris, and thence interpolated for every quarter of an hour for the meridian of Greenwich.

The ellipticity of the Earth was considered one three-hundredth; according to which quantity the equatorial parallax of the Moon was invariably diminished, and the latitude of each place reduced.

In computing the paths of the different digits, and of the contact of the limbs, the augmentation of the Moon's diameter, on account of her altitude was taken into consideration. The diameter of the Sun was diminished 7'' for irradiation. The Moon's motion was not considered uniform throughout the eclipse, as is sometimes done, but her actual distance from the Sun in Right Ascension, and the difference of their declinations, were made use of in each computation.]

The Longitudes are reckoned from Greenwich.

The Longitude of Washington in time is 5h. 7m. 42s.

Phases of the General Eclipse.

The eclipse will first be visible in the North Pacific Ocean.

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Latest termination of the eclipse in the Atlantic Ocean, near the Western Islands.

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Duration of the entire eclipse for the whole earth 5h. 2m. 49s.

Path of the Central Eclipse, that of the contact of the Limbs, and of several of the Digits.

[By the tables of Burckhardt, these paths will pass about 6 miles farther north, and by those of Burg, about 6 miles farther south.]

The Sun will not be eclipsed less than six digits, on his south limb, in any part of the Earth; but the path of six digits, on his south limb, will be almost exactly in contact with the Earth, at sunrise, at Oh. 15m. A. Mean Time at Washington, in Latitude 70° N., Longitude 1244° W.

Path of 9 Digits eclipsed on the South Limb.

Mean time | Mean time Latitude Longitude)

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7 30 44M. 44 41 N.

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Sun rises 9 digits eclipsed at 11 19 26 M.

Sun 9 digits eclipsed

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Duration of this path on the Earth

The path of nine digits begins in the north Pacific Ocean, passes over the northern or internal provinces of the Republic of Mexico, the Missouri and Northwest Territories of the United States, Lake Superior, Upper Canada, Labrador, and Davis' Straits, and ends with the setting of the Sun in Greenland.

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This path begins in the North Pacific, passes across the province of Old California, the Gulf of California, Intendency of Sonora, and the province of New Mexico, in the Republic of Mexico'; through the southeastern part of Arkansas Territory (passing near Little Rock), across the Counties of Shelby, Tipton, Haywood, Madison, Carroll, Humphries, Dickson, Montgomery, and Robertson, in the State of Tennessee; the Counties of Simpson, Warren, Barren, Greene, Washington, Mercer, Casey, Lincoln, Garrard, Madison, Clark, Montgomery, Bath, Fleming, Lawrence, and Greenup, in Kentucky; the Counties of Lawrence and Gallia, in Ohio; the Counties of Mason, Wood, Tyler, and Ohio, in Virginia; the Counties of Greene, Fayette, Westmoreland, Indiana, Cambria, Clearfield, Centre, Lycoming, Bradford, and Susquehannah, in Pennsylvania; the Counties of Broome, Chenango, Otsego, Schoharie, Montgomery, Saratoga, and Washington, in the State of New York; the Counties of Rutland, Windsor, and Orange, in Vermont; the Counties of Grafton and Coos, in New Hampshire; the Counties of Oxford, Somerset, Penobscot, and Washington, in Maine; the north part of New Brunswick; the Gulf of St. Lawrence; the east end of the island Anticosti; the northern extremity of Newfoundland to the Atlantic Ocean; and ends about 450 miles S. W. of Iceland.

Path of the Contact of the Southern Limbs, or Northern Limit of the Annular Eclipse.

This path, whilst on the Continent, will pass about 35 English miles northerly of the path of the Centre, and very nearly parallel thereto; where the Moon is near the horizon, the distance will be about 50 miles.

This path will begin in the North Pacific, and will pass across the provinces of Old California, Sonora, Durango, San Luis Potosi, and Texas, in Mexico; the County of Opelousas, and the Parishes of Avoyelles and Concordia, in Louisiana; the Counties of Wilkinson, Amite, Lawrence, and the south part of the Choctaw territory, in Mississippi; the Counties of Greene, Perry, Bibb, Shelby, and the territory of the Upper Creeks, in Alabama; the territory of the Cherokees, the Counties of Hall and Habersham, in Georgia; Pendleton district in South Carolina; the Counties of Haywood, Buncombe, Burke, Iredell, Rowan, Stokes, and Rockingham, in North Carolina; the Counties of Pittsylvania, Campbell, Charlotte, Prince Edward, Cumberland, Powhatan, Goochland, Hanover, Caroline, King and Queen, Essex, Richmond, and Westmoreland, in Virginia; across the Potomac, the County of St. Mary, Chesapeake Bay, and the Counties of Calvert and Dorchester, in Maryland; the Counties of Sussex and Kent in Delaware; across Delaware Bay and the Counties of Cape May and Gloucester, in New Jersey, into the Atlantic Ocean; thence across Duke's County and the County of Barnstable, in Massachusetts; thence into the Atlantic again, thence across the whole length of Nova Scotia, the islands of Cape Breton and Newfoundland into the Atlantic Ocean for the third time, and will end about 600 miles east of Greenland.

To the inhabitants of the portion of the earth comprehended between the two preceding paths, the Sun will appear to be eclipsed from 11 to 11 digits on his south limb, the magnitude of the eclipse being greatest near the latter path. It will be observed, that a large part of the inhabited poftion of the United States, and a still larger proportion of our principal cities, are contained in this space.

Path of the Central Eclipse for every Minute, from the Time of its coming upon the Continent, in California, till it leaves the Island of Newfoundland, and for every Fifth Minute during the Remainder of the Time of its Continuance upon the Earth.

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Sun centrally ec. 11 58 18 M. 10 52 10 M. 30

2.1 N. 93 27.5W. County of Opelousas.

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0 23 18 A. 11 51 20 M. 33 22.9 N.184 55.1W. Territory of the Lower

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0 34 18 A. 0 18 1 A.135 18.1 N.180 59.7W | County of Lincoln.

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