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HEIGHT OF THE GREATEST OR SPRING TIDES IN 1833.

Computed by the formula of La Place (Mécanique Céleste, vol. II. p. 289.)

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The unit of altitude, at any place, is the altitude or rise of that tide which arrives about a day and half after the time of New or Full Moon, at that place, the Sun and Moon at the moment of ♂ or 8 having been at their mean distance from the Earth and in the plane of the equator.

The unit of altitude at any place can be ascertained only by observation, and, multiplied by the quantities in the above table, will give the height of the spring tides at that place, for the present year.

By the preceding table it appears that the tides of February 5th, March 7th, April 5th, August 16th, September 14th, October 14th, and November 12th, will be the greatest of all in 1833.

The actual rise of the tide, however, depends so much on the strength and direction of the wind, that it not unfrequently happens that a tide, which would, independently of these, have been small, is higher than another, otherwise much greater. But when a tide, which arrives when the Sun and Moon are in a favorable position for producing a great elevation, is still further increased by a very strong wind, the rise of the water will be uncommonly great, sufficient perhaps to cause damage.

The following Table contains the Unit of Altitude of several ports and places on the coast of America, according to the best authorities. The unit of altitude of the several places in the Bay of Fundy was ascer tained by recent observations.

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TIDE TABLE.

The following Table contains the difference between the time of high water at Boston, and at a large number of places on the American coast, by which the time at any of them may be easily ascertained, by subtracting the difference at the place in question from the time at Boston, when the sign is prefixed to it; and by adding it, when the sign is +.

The time of high water, in the calendar pages, is of that tide immediately preceding the southing of the Moon.

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LATITUDE AND LONGITUDE OF SOME OF THE PRINCIPAL PLACES IN THE UNITED STATES, &c., WITH THEIR DISTANCE FROM THE CITY OF WASHINGTON.

The Longitudes are reckoned from Greenwich.

The Capitals (seats of Government) of the States and Territories are designated by Italic Letters.

The Latitude of those places marked with a* has been determined, by the Editor, from actual observations, made by himself within a few months,

and may be relied on within five seconds or less. The Latitude of the places marked with a † has recently been ascertained by others, and communicated for publication.

The Longitude of the places marked with a

*

was computed by the

Editor from observations on the Annular Eclipse of the Sun in Feb. 1831, after correction for the errors of the Moon's place, as given by the tables of Damoiseau. The Longitude of those marked with a † was recently determined by the Editor by chronometers, by comparing the place in question with Washington, the University of Virginia, Philadelphia, or Boston; the position of which is supposed to be correctly ascertained.

The Latitude and Longitude, however, of very many of the places in the following table, where no recent observations have been made, are to be considered only as approximations.

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