The CONTENTS , 1

Prob. VII. To find the Distance between any twagiven Places upon the Globe, and to find all thosePlaces upon the Globe that are at the fame Distance

from a given Place . - - g2

Prob. VIII. To findthe Angle of Position of Places ;or the Angle form’d by the Meridian of one Place,and a great Circle pasting thro’ both the Places —93Prob. IX. To find the Antœci, Perioeci, and Anti-;

podes to any given Place ——— ---—95

Prob. X. The Hour of the Day at one Place, beinggiven ; to find the correspondent Hour (or whato*Clock it is at that Time) in any other Place — 96Prob. XI. The Day of the Month being given, tofind those Places an the Globe where the Sun will

be Vertical, or in the Zenith, that Day . - 97

Prob. XII. A Place being given in the Torrid Zone,to find those two Days in which the Sun Jhall be

Vertical to the fame -— ■ ■■ . -98

Prob. XIII, To find where the Sun is Vertical at anygiven Time assigned ; or, the Day of the Monthand the Hour at any Place (suppose London) beinggiven, to find in what Place the Sun is Vertical at

that very Time - ; —-— " ■■■ ■■■ -..v ibid.

Prob. XIV. The Day, and the Hour of the Day atone Place being given ; to find all those Placesupon the Earth, where the Sun is then Rising ,Setting, Culminating (ar on the Meridian) ; alsowhere it is Day-Light, Twilight, Dark-Night,Mid- Nigh t ; where the Twilight then begins, andwhere it ends : The Height of the Sun in any Partof the illuminated Hemisphere ; also his Deprestionin the obscure Hemisphere . ■ > >. >->>- - - 99

Prob. XV. The Day of the Month being given ; toJhew, at one View,, the Length os Day and Nightin all Places upon the Earth at that Time ; andto explain how the Vicissitudes of Day and Nightare really made by the Motion of the Earth roundher Axis in 24 Hours, the Sun standing still—100Prob. XVI. To explain in general the Alteration ofSeasons, ar Length of the Days and Nights, madein all Places of the World, by the Surfs (or theEarth’s) annual Motion in the EeUptick— 103

Prob,