277

The Use of the Globes.

ijj ^' ari d all the Stars on the Globe will beVe c * Situations as exactly correspond to111 the Heavens ; which may thereforegasify Pound, as will be shewn.

08. XIV. To find the Hour when anyknown Star will rise , or come upon the^ Meridian : '

Ec tify the Globe, and set the Index to1q *8en turn the Globe till the Star comestyjl} ^-Oorizon or Meridian, and the Indexp e w the Hour required.

OB. XV. ‘To find at what Time of theTar any given Star will be on the Me-^ r *dian at XII at Night.

the Star to the Meridian, andtj le what Degree of the Ecliptic is on^ 0r th Meridian under the Horizon;t} tc ^ttd i n the Calendar on the Horizon§tee °f the Year against that De-a «d it will be the Day required.-VII).

’Turor

r - I shall here represent the Cases of/ ^s\l 0nom ical Problems, as they are performableTp^c s es of the Celestial Globe, or by the Stere-fet f rr Tctlon of the Sphere in Piano. Thus ;bl Q.S be the General Meridian,m ^e Axis of the Sphere,jj (bCtbe Equinoctial Line.

^ she Horizon of London ,

^ ^ the Ecliptic, or Sun’s Path.

■ the Prime Vertical , or Azimuth.

t 3 ep

PlateLXVl.Fig. is