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Year. Names of the Months.
5609 Tisri, 15th, *Feast of the Huts or Tabernacles,
66 16th, *Second Feast of the Huts,
21st, Feast of Palms or Branches,⚫
22d, *End of the Hut or Congregation Feast, 23d, *Rejoicing for the Discovery of the Law, Marchesvan begins,·
The Jewish year generally contains 354 days, or 12 lunations of the Moon, but in a cycle of 19 years, an intercalary month (Veader) is 7 times introduced, for the purpose of rendering the average duration of the year nearly or quite correct.
The Mahometan Era dates from the flight of Mahomet to Medina, July 16th, A. D. 622.
The Mahometan year is purely lunar; it consists of 12 synodical periods of the Moon, or of 354 days, 19 times in a cycle of 30 years, and 11 times of 355 days. The average length of this year is therefore 35411 days, which differs only thirty-three seconds from the truth; a degree of exactness that only could have been attained by a long series of observations. But as no allowance is made for the excess of 11 days in the length of a tropical year over the time of 12 revolutions of the Moon, it is obvious that in about 33 years, the above months will correspond to every season and every part of the Gregorian year.
HEIGHT OF THE GREATEST OR SPRING TIDES IN 1848.
Computed by the Formula of Laplace, (Mécanique Celeste, Vol. II. pp. 289, Paris ed., and  Bowd. ed.)
The unit of altitude at any place is the height at that place of that tide which arrives about a day and a half after the time of New or Full Moon, when the Sun and Moon, at the moment of conjunction or opposition, are at their mean distance from the Earth, and in the plane of the celestial equator. This unit of altitude, which must be derived from observation for each place, multiplied by the quantities in the above table, gives the height of the spring tides at that place during the present year.
By the above table it appears, that the highest tides of 1848 will be those of March 7, April 5, May 4, September 14, October 14, and November 12. 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 anoth er, 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 formula, from which these tides were computed, is, however, strictly true only for Brest and its vicinity, and must be regarded as a very uncertain approximation for the coast of the United States.
DARKNESS OF THE NIGHTS DURING THE YEAR 1848.
For Boston, New York, Philadelphia, Washington, &c.
The number of hours at the top of the page denotes the average time for the month from the end of the evening twilight to the beginning of the morning twilight.
The dots in the table denote the hours of entire darkness, when there is neither sun, moon, nor twilight; and their disposition denotes the hours before or after midnight.
Days of Month.
Days of Week
Sun's upper limb rises and sets, (corr. for refract.) M. Time. High Water. M. Time.
16 Su. 7 27 4 53 7 22 4 58 7 17 5 3 7 2 5 176 57 5 23
2 2 2 T 345 ∞ ∞ O
1 20 57
1 22 56 27
23 Su. 7 22
5 2 7 17 5 6 7 12 5 11 7 0 5 23 6 55 5 28
0 24 55 29
0 25 55 30
8 5 18 6 57 5 30 6 52 5 35