The GREAT ORREnt forts

Four Feet in Diameter Made in THO: WRIGHT Mathematical Inftr =ment-maker TO HIS MAJESTY

THE

Defcription and Ufe

OF THE

GLOBES,

AND THE

ORRER Y.

To which is prefixed,

By way of INTRODUCTION, a

Brief Account of the SOLAR SYSTEM.

By JOSEPH HARRIS.

The SECOND EDITION.

LONDON:

Printed for THOMAS WRIGHT, Mathematical In-
ftrument-Maker, at the Orrery and Globe near Salis
bury-Court; and RICHARD CUSHEE, Globe-
Maker, at the Globe and Sun between St. Dunstan's
Church and Chancery-Lane; both in Fleet-ftreet.

M.DCC.XXXII.

ADVERTISEMENT.

MR

R. WRIGHT has lately made several very large ORRERYS, with all the Motions of the primary and Secondary PLANETS, which makes the Price very great: But being willing that Academies, Schools, &c. fhould have the Benefit of this useful Machine, he has contrived an ORRERY, which exhibits what relates to the Motions of the Sun, Earth and Moon; to be fold at a very moderate Price.

He also has great Choice of Mathematical Inftruments ready made by him; as Cafes for Drawing, Surveying Inftruments, Sun-Dials, Weather-Glaffes, &c.

2-28-47

APE

2-27-47

56903

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CONTENTS.

The INTRODUCTION: Containing a brief Account of the Solar Syftem, and of the fixed Stars.

SECT. I. OF the Order, and Periods of the Pri

mary Planets revolving about the Sun;

and of the Secondary Planets round their reSpective Primaries.

-Of the Primary Planets.

-Of the Secondary Planets.

Pag. I 4

Of the Annual and Diurnal Motion of the Pla

nets.

6

7

That the Planets are Opaque and Globular. -That the Earth is placed betwixt the Orbits of Mars and Venus.

8

ibid.

I 2

-That the Planets turn round the Sun.
-That the Earth also turns round the Sun.
How the Annual and Diurnal Motions of the
Planets are computed.

13

-How the Relative Distances of the Planets from the Sun are determined.

15

How their abfolute Distances from the Sun are computed.

19

How the Magnitudes of the Planets are determined.

22

-Why the Moon appears bigger than any of the Planets.

A Table of the Distances, Magnitudes, Periodical and Diurnal Revolutions of the Planets.

-Of Comets.

SECT. II. Of the fixed Stars.

23

24

25

27

-That the fixed Stars are luminous Bodies, at immenfe Distances from us.

The DESCRIPTION and USE of the CELESTIAL and TERRESTRIAL

GLOBES.

35

35

The Geometrical Definition of a Globe, and of the
principal Ufe of the Artificial Globes.
That there will be the fame Prospect of the fixed
Stars, whether the Spectator be placed in the Sun

or on the Earth.

37 SECT. I. An Explanation of the Circles of the Sphere, and of fome AftronomicalTerms arifing therefrom. 39 Of the Divifion of Time.

Of the Atmosphere.

SECT. II. Geographical Definitions.

57

67

70

-Of the Situation of Places upon the Earth. ibid.
Of Zones and Climates.

75

Of the Poetical Rifing and Setting of the Stars. 80 -Of the Surface of the Earth, confidered as it is compofed of Land and Water.

-Of the Appurtenances of the Globes. SECT. III. The Ufe of the Globes.

ibid.

84

PROBLEM I. To find the Latitude and Longitude of any given Place upon the Globe; and on the contrary, the Latitude and Longitude being given, to find the Place.

87

88

PROB. II. To find the Difference of Latitude betwixt any two given Places. PROB. III. To find the Difference of Longitude betwixt any two given Places. PROB. IV. Any Place being given, to find all those Places that are in the fame Latitude with the Said Place.

89

90

PROB. V. The Day of the Month being given; to find the Sun's Place in the Ecliptick, and his Declination.

ibid.

PROB. VI. To rectify the Globes for the Latitude, Zenith, and Sun's Place.

91

PROB.