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Position and Magnitude of the Rings of Saturn, according to Bessel

and Struve, for every fortieth day in the year. Jan. 1. - 7° 25 14°38' 46.001

11.6211 Feb. 9. -7 33 - 15 57 46.96

12.91 March 21. - 40 - 17 2 45.26

13.25 April 30. - 40 - 17 4 42.22

12.40 June 9. -7 34 - 16 2 39.49

10.90 July 19. -7 22 14 12 37.90

9.30 Aug. 28. -75 12 2 37.67

7.86 Oct. 7. - 6 48 10 1 38.87

6.76 Nov. 16. - 6 36

8 44 41.32

6.27 Dec. 26. - 6 34

8 40 44.34

6.68 p.

1.
a.

b. P: Angle between the semi-conjugate axis of the ring ellipse, with the circle of declination ; positive when east, negative when west.

l. Angle of elevation of the earth, above the plane of the ring, as seen from Saturn, positive when north, negative when south.

Semitransverse axis of the ring ellipse. b. Semiconjugate axis; positive, when the northern surface of the rings is visible; negative, when the southern.

It has lately been ascertained, that the planet is not exactly in the centre of the rings.

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The planet Mercury will be visible in the evening until the 11th of February, then in the morning to the 22d of April, then in the evening to the 15th of June, then in the morning to the 4th of August, then in the evening to the 12th of October, then in the morning to the 3d of December, then in the evening.

It is with difficulty that this planet can be seen in any other position, except when at or near its greatest elongation from the Sun, which this year happen January 27th (elongation 18° 24'), March 10th (27° 30'), May 21st (22° 32'), July 8th (26° 29'), Sept. 17th (26° 29'), and Oct. 28th (18° 37'); but the following periods will be most favorable for observing it, this year, as during them it will not only be at its greatest distance from the Sun, but will be nearer the elevated pole, and consequently will remain longer above the horizon. From Jan. 16th to Feb. 4th, in the evening after sunset, bearing W. 15° S.

May 1st to June 4th, in the morning before sunrise, E. 23 N.
Oct. 19th to Nov. 7th,

E. 6 S. The planet Venus will be visible in the evening to the 7th of March, then in the morning to the 20th of December, then in the evening ; its greatest western elongation (45° 59') will take place on the 16th of May; but it will be the brightest, as evening star, on the 13th of January, and as morning star, on the 25th of April.

The planet Mars will be visible in the morning to the 19th of September, then in the evening to the end of the year.

The planet Vesta will be visible in the morning to the 8th of October, then in the evening.

The planet Pallas will be visible in the morning to the 27th of April, then in the evening:

The planet Juno will be visible in the morning to August 25th, then in the evening.

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The planet Ceres will be visible in the morning till the 30th of April, then in the evening.

The planet Jupiter will be visible in the morning till July 5th, then in the evening.

The planet Saturn will be visible in the morning till the 3d of February, then in the evening to the 14th of August, then in the morning to the end

The planet Uranus or Herschel will be visible in the evening till the 26th of January, then in the morning to August 1st, then in the evening to the end of the year.

The superior planets, or all but Mercury and Venus, will appear brightest when nearest to the earth, that is, when in opposition to the Sun.

of the year.

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HEIGHT OF THE GREATEST OR SPRING TIDES IN 1830. Computed by the formula of La Place (Mécanique Céleste, vol. II. p. 289.) New or Full Height of New or Full

Height of Moon. the Tide. Moon.

the Tide. Full M. Jan. 8th, 10h. a. 0.89 Full M. July 5th, 9h. a. 0.85 New " 24 11 0.99 | New

19 7 a. 0.89 Full

7 2
0.88 Full

Aug. 4 8

m. 0.94 New " 22 11 a. 1.11 New «

18 7 m. 0.89 Full 4 March 9

8
0.88 Full

Sept. 2
6

1.04 New 6

9
1.12 New "

16 10

0.89 Full " April 8

2

0.86 | Full Oct. 2 3 m. 1.14 New

6
1.08 | New "

16 3 a. 0.86 Full 66 May 7

7
0.83 Full

31 0

1.13 New 22 2 -0.99 | New Nov. 15 9

m. 0.83 Full 6 June 6 9 m. 0.81 | Full

29 10

1.05 New « 20 10 m. 0.94 New - Dec. 15 3 m. 0.82

Full

29 9 m. 0.98 The unit of altitude, is the altitude of the tide which happens about a day and a half after the time of new or full moon; at the moment of new or full moon the sun and moon being at their mean distance from the earth, and in the plane of the equator.

The unit of altitude of any place, multiplied by the numbers in the precediog Table, will give the height of the tide at that place.

The unit of altitude at Boston, Salem, Marblehead, and Cape Ann, is 114 feet.

Àt New YORK, St. Augustine, Block Island, Elizabeth Town Point, Florida Keys, Hillsborough Inlet, Nantucket Shoal and Town, New Bedford, Rhode Island, and Sandy Hook, 5 feet.

At CHARLESTON, S. C., Monomoy Point, Port Hood, Prince Edward's Islands, St. Simon's Bar, and St. Simon's Sound, 6 feet. These, multiplied by the numbers in the preceding table, give the following, as the heights of the greatest rides, this year, in those places. Tide of Boston, N. York, Charleston,ll Tide of Boston, N. York, Charleston,

&c.
&c.

&c. &c.
ft. in. ft. in.
ft. in.

ft. in. it. in. ft. in. Jan. 9 9 11 4 5 5 3

April 9 9 8 4 4 5 2 25 11 2 4 11 5 11

23 12 2 5 5 6 6 Feb. 8 9 11 4 5 5 3

8 9 4 4 2 4 11 23 126

6 8

23 11 2 4 11 5 11 March 10 9 11

5 3 June 7 9 14 1 4 10 25 12 7

6 9

2U 10 7 4 8 5 8

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&c.

Tide of Boston, N. York, Charleston, || Tide of Boston, N. York. Charleston,

&c.
&c.
&c.

&c. &c.
ft. in. ft. in. ft. in.

ft. in. ft. in. ft. in. July 6 97 4 3 5 1 Oct. 17 9 814 4 5 2

20 10 0 4 5 5 4 Nov. 1 12 9 5 8 6 10 10 7 4 8 5 8

16 9 4 4 2 4 11 19 | 10 0 4 5 5 4 Dec. 1 11 10 5 3 6 4 11 8 5 2 6 3

16 9 31 4 1 4 11 17 10 0 4 5 5 4

30 11 0 14 11 5 11 Oct. 3 12 10 8 6 11

Aug. 5

Sept. 3

It appears by the preceding Table, that the tides of February 23d, March 25th, October 3d, and November 1st, will be the greatest of all in 1830, but the positions of the sun and Moon will not be so favorable this year as the last, for producing a great elevation of the sea ; the height of the tides, however, depends so much on the strength and direction of the wind, that it not unfrequently happens that a tide, which would, independently of this, have been small, is higher than one in other respects much greater.

The following Table contains the unit of altitude of several ports and places on our coast, from the best authorities. The height of the enormous tides in the Bay of Fundy was ascertained from actual observation by a gentleman of Boston, in the summers of 1828 and 1829.

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feet.

feet. Advocate Harbour (Bay of Fundy) 50 Elizabeth Isles Andrews, St.

25 Elizabeth Town Point Annapolis (Bay of Fundy) 35 Florida Keys : Apple River

32

Gay Head. Augustine, St.

5 George's River Basin Bay of Mines (Bay of

60

Georgetown Bar. Fundy)

Goldsborough

12 Bristed 8 Green Islands

16 Broad . 9 Gut of Annapolis

28 Casco

9 Gut of Cansor “ Chignecto (north part of Halifax

60
Bay of Fundy) :

Hills
St. Mary's
16 John's, St. (N. B.)

30 Vert

9
St. (N. F.)

7 Beaver Harbour 7 Kennebec

9 Bell Island Straits 30 Kennebunk

9 Block Island 5 Louisburg

53 Cape Ann 11 Machias

12 Blomidom (Bay of Fundy) 55 Marblehead

11 Chat 13 Mary's, St., Bar .

7 Cod 61 Monomoy Point

6 5 Moose River (Bay of Fundy) 35 46 Henry

41
Island

25
Lookout
9 Mount Desert

12 66 May

Mouths of the Mississippi is St. Mary

14 Nantucket (Shoal and Town) 5 Sable 9 Nassau (N. P.)

7 " Split (Bay of Fundy) 49 New Bedford

5 CHARLESTON (S. C.) . 6 Newburyport

10 Cumberland (Basin Fort), head New Haven

8 of the Bay of Fundy

371
New YORK

5 Digby (Bay of Fundy)

35 Partridge Island (Bay of Fundy) 55 Eastport 25 Passamaquoddy River

25

• Henlopen

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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.

h. m.

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Albany
Andrews, St.
Annapolis
Augustine, St.
Bay, Bristed

Broad
Casco
Chebucto
St. Genevieve, and ?
St. Barbe
Narraganset
Pistolet
St. Mary's
Sandwich

Schecatica
Bermuda Inlet
Cape Ann

Cansor
Charles
Chat
Churchill
Cod
Fear

Hatteras
" Henlopen

Henry
Lookout.
St. Mary

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+ 4 12 Eastport

0 0 0 o Elizabeth Town Point

2 36 O 30 Florida Key

2 40 4 0 Fort St. John

2 30 3 45 Fryingpan Shoals

5 0 0 45 Gay Head

3 53 O 45 Georgetowa Bar

4 30 4 0 Gouldsborough

0 30 Gut of Annapolis

1 30 0 0 Gut of Cansor

3 30 3 53 Halifax

4 0 4 45 Hampton Roads

2 53 2 0 Harbour, Amelia

3 0 2 30 Beaver

2 45 0 30 Nantucket

+030 4 30 Rhode Island

4 45 0 0 Seven Isles

030 3 0 Townsend

0 45 3 45 Hillsborough Inlet

4 0 +0 30 Ice Cove

1 30 4 10 Island, Anticosti, W. end +4 0 0 0 Bell, Straits of

2 15 3 30 Block

3 53 2 30 Button

4 40 2 45 Elizabeth.

1 38 3 50 Fox

0 45 2 30 Green

2 30 2 30 Moose

0 0 2 45 Prince Edward

1 0 3 30 Rhode .

4 45 3 30 Sable

3 0 0 15 Seal

2 45 4 15 Janeiro, Rio

+5 0 + O 30 John's, st. (N. B.) . 030

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Rornan

Sable (N. s.)

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CHARLESTON Cumberland (Basin Fort)

16

Tide Table. Table of Latitude and Longitude.

h. m.

6 Royal

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John's, St. (N. F.)
Kennebec
Kennebunk
Louisburg
Machias
Mary's, St., Bar
Martha's Vineyard
Marblehead
Monomoy Point
Mount Desert .
Nantucket (town)

(shoal)
Nassau (N. P.)
New Bedford
Newburyport
New Haven
New London
NEW YORK
Nootka Sound
Ocracock Inlet
Philadelphia
Plymouth
Portland
Portsmouth (N. H.)
Port Campbell

5 0 Port Hood
0 45

66 Howe.
0 15 66 Jackson
4 15

66 Roseway
0 30
4 0 Providence
3 53 Quebec
0 0 | Race Point
0 0 River, Apple
0 30

St. Croix
+030

Delaware entrance + 0 44

George's
4 0

Penobscot
3 53 Sheepscut
0 15 Salem
1 14 Salvador, St.
2 36 Sandy Hook

2 36 | Savannah
+ 0 50 St. Simon's Bar
2 30

Offing
+ 2 57

Sound
0 0 Sunbury
- 0) 45 Tarpaulin Cove
0 15 Vineyard Sound
2 30 Windsor.

h m 4 0 3 0 3 30 3 15 4 15 2 48 5 30 0 45 0 30 090 · 2 30

0 45 0 45 0 45

0 0 + 4 15

4 53 3 15 4 0 4 45 2 30 2 0 1 38 - 0 30 + 0 30

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S.

LATITUDE AND LONGITUDE OF SOME OF THE PRINCIPAL

PLACES IN THE UNITED STATES, 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.

Latitude.
Longitude,

Dist. from in degrees.

in time. Washington. h. m.

miles. Albany,

N. Y. 42 39 on. 73 42 0ów. 4 54 48.0 366 Alexandria, D. C. 38 49 77 4 5 8 16

6 Annapolis, Md. 390 76 43 5

52

40 Arkansas,

Ark. 33 3 91 30 6 6 0 1470 Arkopolis,

Ark. 34 34 92 10 6 8 40 1237 Augusta, Ga. 33 19 80 46 5 23

589 Augusta,

Me. 44 16 69 44 4 38 56 612 Augustine, St.

Fa.

29 45 81 30 5 26 00 880 Baltimore City, Md. 39 23 176 40 5 6 40 37 Baton Rouge, La. 30 36 91 15 6 5 0 1356 Beaufort,

S. C. 32 28 80 33 5 22 12 630 Blakely,

Ala. 30 43 88 3 5 52 12 1100 Boston City, Ms. 42 20 59 71 4 9 4 44 16.6 436 Brattleborough, Vt. 42 52 72 27 4 49 48.0 427 Burlington, Vt. 144 28 73 15 4 53 0 501 Cahawba,

Ala. 32 20 87 7 5 48 28 950 Cambridge, Ms. 42 21 59 171 725 4 44 29.7 435

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