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The altitude and declination of any Star, with the right ascension of the Sun, and hour of night given to find the Stars right ascension.
By Probl. 5. or 14. find the Stars hour from the Meridian. Then on the line twice 12, or 24, set one point of your Compasses in the Stars hour (thus found) and extend the other to the hour of the night. Upon the same line with this distance set one point of your Compasses in the right ascension of the
Sun, and turning the other point the same way, as you did for the hour, it gives the Stars right ascension.