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THE Aequinoctial is a great Circle, and in the Sphere it is elevated above the Horizon (upon the Meridian Cir∣cle) so much as is the Complement of the Latitude of the Place. As at London, where the Latitude is 51 degr. 30 min.
there the Aequinoctial is elevated 38 degr. 30 min. (which is so much as 51 degr. 30 min. wants of 90 degr.) and it cutteth the Horizon in the Points of East and West. Unto this Circle when the Sun cometh (which is twice every year, namely, about the 10. of March and the 12. of September) it causeth the Daies and Nights to be of equal length all the World over. This Circle is noted in the Scheme with AE A ae, and cuts the Horizon in the Point A, which represents both the East and West Points thereof.