5

6. A Meridian Plane parrllel to the Meridian, the Circle of the Hourof 12, which paſſeth through che Zenich, the Pole, and Points of theSouch and North, being right to the. Horizon, and the prime Vertical.This is kere reprelented by 8 Z N., 8 1 57. A. Meridian Plane inclining to che Horizon, parallel to any GreatCircle, which paſſeth through the Points of douth and North, being rigeto the prime Vertical, but inclining to the Horizon. This is here repreſent-ed by s G: Ne e 58. A. Vertical Declining Plane, parallel to any Great Circle, Whicli pas- fleth through the Zenith, being right to the Horizon, but inclining to the 3Meridian. This is repreſented by BZ D. 5 8*

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