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The declination given to find the Suns altitude at East or West in North declination, and by con∣sequent his depression in South declination.
Take the declination given from the Scale of altitudes, and setting one point of your Compasses in 90 on the line of Azimuths, lay the thread to the other point (on that side
90 next the head) on the limb it cuts the al∣titude, counting from 60/0 on the moveable piece. Ex. gr. at 10 deg. declination the al∣titude is 12 deg. 40 min.