Excerpt: ...much is the declination, or sloping of the Zodiacke. This circle is also called the Eclipticke line, because when the Sunne and Moone stand both in this circle opposite each to other, then there happens an Eclipse of the Sunne or Mone, vpon a globe it is easily discerned, by the sloping of it from the Aequator, and the diuisions of it into 12. parts, and euery of those 12. into 30. degrees. These are the greater circles: the lesser follow; which are all of one nature, and are called by one generall name: sc. Parallels, because they are so drawen on each side of the Aequator, as they are equidistant vnto it euery way. Many of this kinde are drawne vpon the globe (as is easie to bee seene) and may bee conceaued to bee drawne vpon the earth: but there are only two sorts cheifely to bee marked: namely the Tropickes and the Polar circles. The tropickes are two, parallel circles distant on each side of the Aequator 23. degrees shewing the farthest bounds of the Sunns declination North or South from the Aequator, or the midest of heauen. And therefore they are called tropickes a
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