Volltext : Adams, George: Astronomical and geographical essays containing I. A comprehensive view of the general principles of astronomy; II. The use of the celestial and terrestrial globes; III. The description and use of the armillary sphere, planetarium, tellurian, and lunarium, IV. An introduction to practical astronomy, or, the use of the quadrant and equatorial

DESCRIPTION  AND  USE
264
In  turning  the  globe  about,  the  equator  keeps
always  under  one  point  of  the  strong  brass  meridian, ¬
  from  which  point  the  degrees  on  the  said
circle  are  numbered  both  ways.
Or  THe  ECLIPTIC.
The  graduated  circle,  which  crosses  the  equator ¬
  obliquely,  forming  with  it  an  angle  of  about
2314  degrees,  is  called  the  ecliptic.
This  circle  is  divided  into  12  equal  parts,  each
of  which  contains  30  degrees.  The  beginning  of
each  of  these  30  degrees  is  marked  with  the  characters ¬
  of  the  12  signs  of  the  zodiac.
The  sun  appears  always  in  this  circle;  he  advances ¬
  therein  every  day,  nearly  a  degree,  and
goes  through  it  exactly  in  a  year.
The  points  where  this  circle  crosses  the  equator
are  called  the  EQUINOCTIAL  POINTS.  The  one  is
at  the  beginning  of  Aries,  the  other  at  the  beginning ¬
  of  Libra.
The  commencement  of  Cancer  and  Capricorn
are  called  the  SOLSTITIAL  POINTS.
The
            
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