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Talk of the Elliptic Motion* of the Planets, as given hy La Place in his. Sj/j/ej«e
<lu Monde, Troisicme Edition, 1808.

Durations of their Sideiml Revolu-
tion.

Years Dnys Hours M. Seek

Mercury..0 87 23 13 43" 394

Venus .. 0 224 16 49 11 192

Earth 1 0 6 9 11 527

Mirs 1 321 23 30 39 047

Jupiter 11 317 14 18 40 976

Saturn..29 173 23 1G 34 176

C=Mg' ?84 23 17 6 16 174

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Semi Major Axes of their Orbits, or

their Mean Distances.

Mercury 0 3870981

Venus 07233323

Earth 10000000

Mars 15236935

Jupiter , 52027911

Saturn 9 5387705

Georgium Sidus 191893050

Proportion of the Eccentricity of the

Semi Major Axes.

Secu'ir VariatiorL.

Mercury .0-20551494+0-0 J0003867
Venus ...0-00685298—0 000062711

Earth 0-01685318—0-0000416:2

Mars 0-09313400+0 000090176

Jupiter ..004817840+0-000159350
Saturn.. .005616830—0000312402

GsTdus J Q'04€67030—0-000025072
Their mean Longitudes from the Vernal
Equinox, at the Midnight, which
separates the Slsr December, 1800,
and the let January, 1801, mean
time at Paris.

Mercury 163» 56' 26" 96

Venus 10 44 55 97

Karth 100, 9 12 99

Mats 64 7 2 29

Jupiter 112 12 86 10

Saturn 1j5 20 31 63

<3eorgmn»Sidui..l77 47 17 50

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Table of the Four New Planets, from the Same.

Sidereal Revolution 1801.

Yean Days Hrr, M- Sec

4 221 12 56 9

4 221 17 0 57

4 100 S3 57 7

Ceres

Pallas

Sana

Vesta 3 240 4 55 12

J>f«tn Distances,

Earth being unity. Eccentricity.

Ceres 2-7674060 0-0783486

Pallas 2-767592 0-245384

Juno 2-667163 0254944

Vesta 2-373000 0-093220

Mt.m Longitude from tie 1'erncU Eqninor, Epoch 1801.

Ceres 264" 45' f

Pallas 252 37 2

Juno S90 30 52

Vesta...'. 1..2G7 23 1

Mem Longitude nf Perilidina, same Spofft.

Ceres 146° 39' 39"

Pallas 121 14 1

Juno '. 53 18 41

Vesta 249 43 0

Inclination of their orbits to Ecliptic.

Ceres' 10° 37' 34''

Pallas 34 37 8

Juno 13 3 28

Vesta 7 8 46

Longitudes of dacending Nodes, same Epoch.

Ceres 80<> 55' 3"

Pallas ... 172 33 48

Juno 171 6 38

Vesta 103 1 0

N B. all these are for the same Epoch, say 31st Dec. 1800,'at midnight, mean time at Paris.

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A

LIST OF THE PRICES At which the Instruments described in this Work,

ARE MADE AND SOLD BY

IV. And S. JONES,

30, Hui.horn, London.

Plate XL and XII.

The complete Planetarium, Tellurian, and Lunarium, all in brass; the box, ABC, plate 11, fig. 1, mounted on a pedestal with claw feet, and the instrument with all its appendages packed in a portable mahogany

case 37 16 0

N, B. This instrument, by being divided into three parts, admits the various phenomena to be exhibited in a complete and perspicuous manner.

Portable Transit, plate 12, fig. 3 ., 20 0 /O

Plate XIV.

Fig. 1'. The simple Astronomical Quadrant or Angular Instrument, all in brass, of about 4| inches radius, in acase I 13 9

Ditto, with rack-work motions, telescopic sight, reflecting eye-piece to observe to the zenith, horizontal spirit levels, ifc. packed in a pocket mahogany case 440

For the representations and descriptions of portable, more simple, and less expensive Orreries, see the pamphlet entitled, The

Description and f/se of a New Portab1e Orrery, by W. Jones; The Sixth Edition, IS 12,price3s. and sold as above.

Fig. 2, The Portab1e Equatorial or Universal Suit-dial, all in brass, the radius of the circles about 3£ inches in diameter, in a case 880

An improved accurate Equatorial 47 5 0

Plate XV.

The Globes, as represented in the plate, are, according to the mode of mounting by G. Adams, the father of our late author, and according to the dimensions of 12 or 18 inches, and the quality of the frames, the pair, from 5/. 5.r. to 15 15 0

For an account of the New British Globes, see the Advertisements prefixed to the Table of Contents of this Work.

AN INTRODUCTION TO PRACTICAL ASTRONOMY,

or the Use of the Quadrant and Equatorial; selected from the Astronomical, &c. Essays, with 2 Plates, Price 3s.

ESSAYS ON THE MICROSCOPE, containing a particular Description of the most improved Microscopes; a general History of Insects; a Description of 379 Animalcula; a View of the Organization of Timber, and the Configurations of Salts when under the Microscope, &c. &c. Second Edition, by Frederic Kan." Hacher, in 4to, and illustrated by 33 Plates. Price 1/. 16s-. m boards. Reprinting by W. & S. Jones.

AN ESSAY ON ELECTRICITY, explaining clearly and fully the Principles of that carious and useful Science, 8vo. in Boards.

AN ESSAY ON VISION, Third Edition, 8vo. in Boards.

GEOMETRICAL AND GRAPHICAL

ESSAYS.

Containing a general Description of the best and most approved
Mathematical Instruments, in Geometry, Civil and Military ,H

Surveying, Levelling, Perspective, Gunnery, &c. with many new , J,

practical Problems, illustrated by 34 Copper-plates. By the late George Adams, with Corrections and Improvements. By Wrr,. 1IAM Jones, F. Am. P. S. Fourth Edition, 8vo.

LECTURES

IN

NATURAL AND EXPERIMENTAL

PHILOSOPHY.

In 5 vols. 8vo. the fifth Volume consisting of the Plates and Index, revised and corrected by the above Editor. Reprinting.

1812.

Gleudinning, Printer, 25, Hatton Garden, London.

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