The theoriques of the seuen planets shewing all their diuerse motions, and all other accidents, called passions, thereunto belonging. Now more plainly set forth in our mother tongue by M. Blundeuile, than euer they haue been heretofore in any other tongue whatsoeuer, and that with such pleasant demonstratiue figures, as euery man that hath any skill in arithmeticke, may easily vnderstand the same. ... VVhereunto is added by the said Master Blundeuile, a breefe extract by him made, of Maginus his Theoriques, for the better vnderstanding of the Prutenicall tables, to calculate thereby the diuerse motions of the seuen planets. There is also hereto added, The making, description, and vse, of two most ingenious and necessarie instruments for sea-men ... First inuented by M. Doctor Gilbert ... and now here plainely set downe in our mother tongue by Master Blundeuile.

CHAP. IX.

Of the third Heauen, or Heauen of Venus.

THe next Heauen vnder that of the Sunne, is the Heauen of Venus, which hath his proper mouing from West to East.

This Heauen hath foure orbes, as the Heauen of the three higher Planets haue, that is to say, two, which are called the deferents of the two Auges, then the Orbe

Excentrique, or the deferent of the Epicicle, and the Epicicle it selfe, in the circumference whereof the Planet is alwayes carried. And because I haue defined the said orbes in the fift Chapter, I thinke them needlesse to be here againe repeated: and therefore I referre you to that Chapter: For the Orbes of Venus doe not differ from the Orbes of Saturne in shape and position, but onely in the quantitie of their motions.

The deferents of the Auge and opposit Auge in the Heauen of Venus do continue without any motion, and the place of her Auge, which is in the Eclipticke of the eight Heauen, is alwaies 48 degrees, ⁱ ₂₁· reckoning from the first starre of the Rams horne: and the opposit Auge is alwaies 3 Sex. 48 degrees, ⁱ ₂₁· from the first starre of the Rams horne, accounting the said distance according to the succession of the signes. The Excentrique of Ve∣nus mooueth according to the succession of the signes vpon his proper centre, which is differing from the cen∣tre of the world, and the poles and axletree of this Orbe are moouable, sometimes approching neare vnto the poles of the Eclipticke, and at other times are further off. Howbeit this Excentrique maketh one entire reuoluti∣on, beginning at the first starre of the Rams horn in 365 dayes, 6 houres, ⁱ ₉· ⁱⁱ ₃₉· so as the moouing of this orbe is equall vnto the simple equall mouing of the Sunne, be∣fore defined in the 19 definition of the 8 Chapter. And therefore the line of the meane moouing of the centre of Venus her Epicicle, is alwaies in the same place of the Zodiake, in which the line of the meane mouing of the Sunne is: so as in seeking for the meane mouing of Ve∣nus her longitude, you are to find the simple equall mo∣uing of the Sunne in such order as the eight Precept tea∣cheth:

from which if you subtract 48 degrees, ⁱ ₂₁· the remainer will shew the meane Anomalia of the Excen∣trique, or meane centre, before defined in the 13 defini∣tion of the 7 Chapter. Which if you subtract out of the true motion of the longitude of the Epicicle (which is defined in the 17 definition of the 7 Chapter) the remai∣ner will be the true centre or the equated Anomalia of the Excentrique, which is defined in the 16 definition of the 7 Chapter.

The Epicicle of Venus hath also his proper motion in the Excentrique, whereby it swarueth from the plane of the Excentrique.

The semidiameter of the Epicicle is 43 degrees, ⁱ ₁₀· such like degrees, as the semidiameter of the Excen∣trique containeth 60 degrees. And because that the line of the meane moouing of her centre is all one with the line of the meane moouing of the Sunne, it may easily appeare, that the starre or Planet will be twice conjoined with the Sunne in one reuolution of her Epicicle, that is to say, once in the Auge, and once in the opposit Auge of the Epicicle. But if she be neither in the Auge nor in the opposit Auge of the Epicicle, then in her ascending from the opposit Auge of her Epicicle vnto the Auge thereof she goeth before the Sunne, and is our morning star, called of the Latines Lucifer. But in descending from the Auge of her Epicicle vnto the opposit Auge therof, she goeth after the Sunne, and is our euening star, called of the Latines Hesperus.

The daily mouing of the Anomalia of Commutati∣on (which was defined in the 23 definition of the 7 chap∣ter) is ⁱ ₁₆· ⁱⁱ ₅₉· ⁱⁱⁱ ₂₈· and the yearely motion thereof is 3 Sex. 45 degrees, ⁱ ₁· ⁱⁱ ₄₅· ⁱⁱⁱ ₂₁· and maketh one entire reuolution

in one yeare 218 dayes, 21 houres, 15 minutes.

The greatest equacion of her Epicicle is 45 degrees, ⁱ ₁₀· ⁱⁱ ₂₀· if the centre of the Epicicle be in the Auge of her Excentrique, and that the Planet bee distant from the Auge of the Epicicle any way 2 Sex. 15 degrees, ⁱ ₅· but if the centre of the Epicicle be in the opposit Auge of the Excentrique, and that the Planet be distant 2 Sex. 17 degrees from the Auge of the Epicicle, then is the grea∣test equacion of the argument of Venus 46 degrees, ⁱ ₅₁· ⁱⁱ ₂₉· What other points, lines, and arches are needfull to be known for the calculating of her motion at any time, are set downe before in the 7 Chapter, vnto which I re∣ferre you, onely the finding of the equacions belonging vnto this Planet, must be sought for in the 22 Cannon, in such order as is taught in the 34 Precept. And thus I end with Venus.