An astrological discourse with mathematical demonstrations proving the powerful and harmonical influence of the planets and fixed stars upon elementary bodies in justification of the validity of astrology : together with an astrological judgment upon the great conjunction of Saturn & Jupiter, 1603 / written by that worthy, learned gentleman, Sir Christopher Heydon, Knight ; and now published by Nicholas Fiske ...

CHAP. XV.

Intension and Remission by Parallelism.

I Have before spoken of the place and motion of the Planets; now I intend to shew, That the Parallel which the Planets describe by reason of their place and Motion, is likewise of great force to cause Intension and Remission, when any two, or more of them, happen to describe the same Circle aequidistant from any of the Tropicks. For then having equal De∣clination towards the same side of the Aequinoctial, they rise and set exactly in the same points of the Horizon: they

come to the Meridian at the same height; the Ark also which they de∣scribe above the Horizon as well as un∣der the same; by reason whereof their Beams succeeding one another, shall not only impress the very same line up∣on the Earth, but besides in their like scituation and distance of each side of the Meridian their Beams shall make right Angles of Incidence, whereby at that time they are also united by reflextion; as in this Figure.

[illustration]

Diagram.

Where let N H M F be supposed the Horizon, M N the Meridian, H F the Aequinoctial, D E the Tropicks, or some other Parallel; A B the two Stars which are turned in the same: and with∣out further demonstration it is evident to the eye, That if A rise at the point D in the Horizon, pass the Meridian at O, and set at E: the Star B moving in ano∣ther part of the same Parallel shall do the like, and coming-to an aequidistant scitu∣ation with A from the Meridian, the Angle B O C shall be equal to the Angle A C O, being the Angles of Incidence to both Stars; by means whereof B shall of necessity reflect unto A, and A to B, which is of great moment in their ope∣ration, especially to them to whom the same hapneth to be perpendicular. And here by the way we are to note, That by how much neerer the Tropicks this Pa∣rallelism doth happen unto the Planets, either amongst themselves, or with the fixed Stars, so much more effectual the same shall be, because of the slow varia∣tion of their declination which will cause them to continue Parallel the longer to∣gether: whereas neerer unto the Aequi∣noctial

it is of less moment, because their declination varying swiftly, will also as suddenly vary their Parallelism. And thus much concerning the natural Rea∣son of Intension and Remission, which hapneth while the Planets and fixed Stars do thus follow and wait one upon ano∣ther, and by means thereof imbrace and infold every thing whereon they shine, as if equal care were committed to both their charges, as they are carryed about by the wrapt Motion of Heaven.

Notes

• The Reason why Paral∣lolism is so effectual.
• Paralelism why most effectual neerest the Tropicks.