Sentence:  But becauſe ſome Aſpects are more Effectual than others, therefore they are ("reſpectu graduum", "Scientiæ" and "Congruentiæ", "necnon Efficacitatus") thus to be Diſposed: "viz." ☌. ☍. ◻. △. ⚹. "SS. Q. Bq. Vc. Dec. Td. Sq. SSq." whereunto are added (as in the laſt and loweſt degree of Dignity and Efficacy) the "Quindecile", <WSD>"Hexadecile</WSD>", "Vigintile", and the "Icoſiteſſeragonall", (or figure of 24 ſides), which are only considered in Venus and Mercury with the Sun. 
Meaning of the word marked with <WSD> tags:  The aspect or position of any two celestial bodies separated by 22.5° (that is, 360° divided by 16) as they appear to an observer on earth.