Vim must understand that imposed on these poles is 

 the firsl mobile [Primum Mobile], everywhere convex, 



.mil divided, into ia equal parts Dodecate ia by 



the 6 greatest circles, intersecting eachothei at the centers 

 of the poles [hen it is divided by anothei equally great 

 circle, everywhere equidistant limn the pules, into two 



hemispheres. One hemisphere i if IS parts, proceeding 



in ordei from west setting] to east [rising] should be 

 assigned the respective signs of the zodiac; thai is. one 

 to Al ies, the next to Taurus, and so on, etc. The circle 

 which cuts those 12 parts transversely in the middle, you 

 e.ill the eeliptie. I hen. these capital sp.iies of the 

 Primum Mobile are subdivided by degrees, minutes. 

 etl . both in longitude and in latitude. s< . thai this 

 heaven represents a kind of great spherical net. extended 

 tu capture the longitude and latitude of the Sta 



Mobile on the aforementioned pules. Note, however 



(and this is alm< St the leading point of the) • 



in that circle of longitude which divides the sign oi 



Gemini from Cancer and Arcitenens Sagittarius] 

 from Capricorn, you must conceive two points, directly 

 opp sin- each other and removed about twenty-three 

 and a hall degrees from tin- poles: Boreal the northern] 

 between Gemini and Cancer; Austral [the southern 



between Sagittarius and Capricorn. I hese two points 

 l.\ some power (imagine it is magnetic power), equal 

 between them, hold the terraqueous orb suspended 



in the middle, In acting mi the axis of the same orb 



(imagine 11 is iron) in sui h .1 way that the earth is con- 



tinu.ilK drawn t<> those two points as to two opposite 



It is nevei nearer to one. for as it is about to 



■ .'..nils one, the opposite powei is constantly 



drawing it bai k. I hits, both those points and the axis 



oi the earth are alway held in one common line, wherever 

 those points happen to be carried by the rotation of 

 this heaven. 



Again, it is necessary foi you <•■ conceive in this 

 heaven, first, two greal circles, bisecting each other at 



right angles in the Cenl ( )ne of 



these circles, passing tl igh the lust point ol Vries and 



Libra in the ecliptic, is called equinoctial colure: the 

 othei circle, passing consequently between the Inst 

 punt of ( .mi ■■! and Capricorn, is railed 9 ilstiti.d colure. 



Beneath these .ue likewise imagined main other great 



circles, in the renters oi the magnets dividing 1 

 in the shape of an "X.'" But if, receding from these 

 magnets, you dest 1 ibe ■ in Ies 1 parallel to each other and 

 ever greater and greater, up to the greatest circle which 

 you will perceive is called the equator), equidistant 

 from each magnel and obliquely splitting the ecliptic 

 in the equinoctial colure. you can then Ix-hold a great, 

 new. woven net in this heaven of the Primum Mobil.. 



This nei in isi beautifully ex] - 1 the sti aight 



(.1 < ISSARY 



Anomolia or anomaly, is the angular distance of a 

 planet from its perihelion (that point of the orbit 

 ol .1 planet which is nearest to the sun) as seen from 

 the sun. 



Ai 01 ism HUM or the equinox, is the time in which 

 days and nights are equal in the space of hours. 

 1 here are two equinoxes: the Spring equinox — C. 8 

 calends of April in the sign of Aries; and the fall 

 equinox — c. to calends of October in the sign of 

 Libra. 



Aeras is derived from aera, aerae, which originally 

 meant a given number, usually used in regard to 

 money. The word was Liter extended to mean a 



number used in any calculation, and finally it 

 to mean a certain lime from which subsequent 

 times were counted, e.g.. Anno Domini, after the 

 Birth of Christ. 

 (011 R] or the Colures, which are two circles in the 

 heavenly sphere, passing through the poles of the 

 world and cutting each other .11 right angles: the 

 one passes through the equinoctial points ol \ii'-s 

 and Libra and is called Colurus Aequinoctiorum or 

 equinoctial colure; the other touches the wlstitialia 



of Cancer and Capricorn and is called Colurus 

 S litiorum or solsmi.il colure. 1 hev are called 

 Colurus. which is translated as "mutilated tails." 

 for the part which emerges in the Antarctic is not 

 visible and is quasitruncated. 



Ei LIPTICA oi the ecliptic, is an imaginary line in the 

 heavens in which the sun was supposed to have 

 performed its annual course. 



Epicyclus or epicycle, is a small orb which, being 

 fixed in the deferent of a planet, is carried along 

 with its in et, with its own peculiar 



motion, carries the body of the planet fastened to 

 it round about its proper center. 



Iris or the rainbow. In mythology, Lis was the 



daughter of I haumatis and Electra, messei 

 Juno of the goddesses ,md Jove of ill' 

 Solstith \t or the solstice, is that time when the sun 

 seems to st. mil still I,. 1 .1 slum lime: when the sign 

 of Cancer enters the month of June (equivalent to 



the summer solstice, when the sun begins to recede 

 from ust; and when the sign of Capricorn enters the 

 month of December (equivalent to the winter 

 solstice, when the sun begins to accede to 



PAPER $5: Tin. HORiiinsi astronomic: u 1:1 ock 



55 



