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Year. Names of the Months. 5606 Tisri 21st Feast of Palms or Branches Oct. 22, 1845, 16 22d *End of the Hut, or Congregation Feast" 23,

23d *Rejoicing for the discovery of the Law 24,
Marchesvan begins

Nov. 1,
Chisleu begins

30,
25th Consecration of the Temple

Dec. 24,
Thebet begins

30, 10th Fast for the Siege of Jerusalem Jan. 8, 1846. The Jewish year generally contains 354 days, or 12 lunations of the Moon, but, in a cycle of 19 years, an intercalary month (Veadar) is 7 times introduced, for the purpose of rendering the average duration of the year quite or nearly correct.

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The Mahometan Era dates from the flight of Mahomet to Medina, July 16th, A. D. 662.

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 35438 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 1845.

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Computed by the formula of "Laplace (Mécanique Céleste, Vol. II pp. 289

Paris ed., and [2858] Bowd. ed.)
New or Full
Height of New or Full

Height of Moon. the tide. Moon

the tide. h.

h. New Moon, Jan. 8, 2 M. 1.03 Full Moon, July 19, 1 M. 1.04 Full

23, 9 M. 0.84 New Aug. 3, 2 M. 0.82 New Feb. 6, 1 A. 1.05 Full

17, 8 M. 1.08 Full 22, 2 M. 0.95 New Sept.

1, 4 A. 091 New March 8, 1 M. 1.02 Full

15, 5 A. 105 Full 23, 3 A. 1.01 New

Oct.

1, 6 M. 0.97 New April 6, 3 A. 0.93 Full

15, 5 M. 0.96 Full 22, 2 M. 1.02 New

30, 7 A. 0.91 New May 6, 5 M. 0.82 Full Nov. 13, 8 A. 0.85 Full

21, 11 M. 1.00 New Dec. 29, 9 A. 0.99 New

June
4, TA. 0.75 | Full

13, 2 A. 0.78 Full 19, 6 M. 1.00 New

28, 6 A. 1.03 New July 4, 11 M. 0.75

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 1845 will be those of February S, August 19, and September 17.

The actual rise of the tide, however, depends so much upon 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 eleva. tion, is still further increased by a very strong wind, the rise of the water will be uncommonly great, suficient 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.

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 ascertained by recent observations. Feet.

Teet. Advocate Harbor, (Bay of Fundy) 50 Bay, Cignecto, (north part of Bay Andrews, St.

25
of Fundy)

60 Annapolis, (N. S.)

30
St. Mary's

16 Apple River

50
Vert

7 Augustine, St.

Beaver Harbor

7 Basin of Mines, (Bay of Fundy) 60 Bell Island Straits

30 Bristed 8 Block Island

6 «' Broad

BOSTON

112 " Buzzard's

5
Cape Ann

11 Casco

Blomidom, (Bay of Fundy) 60

Bay,

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Feet.

Feet. Cape Chat

13 Moose River, (Bay of Fundy) 30 Cod Light House

61
Island, (Me.)

25
Harbor
11 Mount Desert

12 D'Or, (Bay of Fundy) 50 Mouths of the Mississippi

11 Henlopen

Nantucket, Shoal and Town 5
Henry

41 Nassau, (N. P.)
Lookout
9 New Bedford

5
May
Newburyport

10 St. Mary 14 New Haven

8 Sable

9 Newport Split, (Bay of Fundy) 55 NEW YORK CHARLESTON, ('8. C.)

Norfolk Cumberland (Basin Fort) head of Partridge Island, (Bay of Fundy) 55 the Bay of Fundy 71 Passamaquoddy River

25 Digby, (Ń. S.) 30 Penobscot River

10 Eastport 25 Plymouth

111 Elizabeth Isles

5 Portland
Town Point
Port Homer

8 Florida Keys

“ Hood Gay Head, ( Vineyard)

" Jackson George's River

“ Roseway Georgetown Bar

Portsmouth, (N. H.)

10 Gouldsborough

12 Prince Edward's Island Green Islands 16 Providence

5 Gut of Annapolis

30 Rhode Island Harbor Gut of Cansor

Richmond
Halifax

8
Salem, (Mass.)

11 Hampton Roads 5 Sandwich Bay

8 Hillsborough Inlet 5 Sandy Hook

5 Holmes's Hole 4 Seven Isles Harbor

31 John's, St. (N. B.) 30 Sheepscut River

9 “ N. F.)

7 Shubenacadie River, (B. of Fun.) 70 Kennebec

Simon's, St. Bar Kennebunk

9

6 Sound Long Island Sound

5 Townsend Harbor Louisburg, (C. B.)

51 Truro, (Bay of Fundy) Machias

12

Vineyard Sound Marblehead

11 Windsor, (Bay of Fundy) Mary's, St. Bar

Wood's Hole Monomoy Point

Yarmouth, (N. S.)

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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 ti

The time of high water, in the calendar pages, is of that tide which immediately precedes the southing of the Moon. Albany +4 12 Bay, Casco

0 45 Andrews, St. 0 0 Chebucto

4 0 Annapolis, (N. S.)

0 30 Genevieve & St. Barbe 0 0 Annapolis, (Md) 4 18 Buzzard's

3 50 Augustine, St. 4 0 Narra ganset

3 53 Bay, Bristed -3 45 Pistolet

4 45 0 45 St. Mary's

2 0

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Bay, Sandwich, (N. S.) - 2 30 John's, St. (N. F.)
Schecatica

- 0 30 Kennebec Bermuda Inlet

. 4 30 Kennebunk Cape Ann

0 0 Louisburg Cansor

30 Machias Charles

-3 45 Marblehead Chat

to 30 Martha's Vineyard, ('W. P't) Churchill

-4 10 Mary's, St. Bar Cod

0 0 Monomoy Point Fear

-3 30 Mount Desert Hatteras

- 2 30 Nantucket, (Town) Henlopen

- 2 45

(Shoal) Henry

- 3 50 Nassau, (N. P.) Lookout

3 50 New Bedford St Mary

- 2 30 Newburyport May

- 2 45 New Haven Romain, (S. c.).

3 30 New London Sable, (N. S.)

-3 30 Newport Split

0 15 NEW YORK CHARLESTON

–4 0 | Nootka Sound Cumberland, (Basin Fort) . + 0 30 Norfolk Eastport

0 0 Ocracock Inlet Elizabeth Town Point, - 2 36 | Old Point Comfort Florida Key

- 2 40 | Philadelphia Fort St. John

- 2 30 Plymouth Fryingpan Shoals,

5 0 Portland Gay Head

3 53 Portsmouth, (N. H.) Georgetown Bar

- 4 30 Port Campbell Gouldsborough,

0 30 Hood Gut of Annapolis

- 1 30 Howe Gut of Cansor

- 3 30 16 Jackson Halifax

-4 0

« Roseway Hampton Roads

. 3 30

" Royal Harbour, Amelia

- 3 0 Providence Beaver

- 2 45 Quebec Nantucket

+0 30 Race Point Rhode Island -4 45 Richmond Seven Isles

- 0 30 River, Apple Townsend

-0 45

St. Croix Hillsborough Inlet

4 0

Delaware, entrance Holmes's Hole

-1 20

George's Ice Cove

-1 30

Penobscot
Island, Anticosti, W. end

Sheepscut
Bell, Straits of

- 2 15 Salem, (Mass.)
Block

- 3 53 Salvador, St. Button

- 4 40 Sandy Hook Elizabeth

- 2 50 Savannah Fox

045 St. Simon's Bar Green

2 50

Offing
Moose

0 0

Sound
Prince Edward 1 0 Sunbury
Rhode

-4 45 Tarpaulin Cove
Sable

- 3 0 Vineyard Sound Seal

- 2 45 Windsor Janeiro, Rio

+5 0 Wood's Hole John's, St. (N. B.j.

0 30

h. m. - 50 0 45 0 15 4 15 0 30 0 0 3 53 4 0 0 0

0 30 +0 30 +044 -4 0 3 30 0 15 0 14 2 36 - 3 50 - 2 20 +0 50

3 0 2 30 - 5 25 + 2 57

0 0 0 45 0 15 2 30 4 0 3 0 - 3 30

3 15 - 4 14 3 5

5 30 - 0 15 + 4 20 -0 30

0 0 2 30 0 45 0 45 0 45

0 0 +4 15

4 38 3 15 4 0 - 4 5 2 30 2 0 -2 38

0 30 +0 30 - 2 50

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DARKNESS OF THE NIGHTS DURING THE YEAR 1845.

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 evening twilight to the beginning of 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
Month.

January Feb'y March April May Jun. July Aug. Sept. Oct.

12 h. 11 h. 9h. 8 h. 7 h. 5 h. 6 h. 7 h. 8 h. 9 h.

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