Page:Description and Use of a New Celestial Planisphere.pdf/39

34 a Sutton's Quadrant in hand, it will do in this cae; but, if neither are in your poeion, then the Planisphere will be ufficient for this work. Thus, hang a mall plummet by a fine hair to the center-pin, then tick a fine pin in the morning hour line of 6, and another in the ame line near the center, both perpendicular to the Plane, then hold the Planisphere up with the Southern 12 to the Vertex, and the Eat ide next the Sun, and elevate the index, till the hadow of the outermot pin falls on the other, and then the hair will show the Altitude on the lower limb of the index, counting each division for a degree from the Northern 12 to the right hand.—Thus, for Example, on Augut the 13th, 1802, I find the Sun's Altitude in the forenoon 43°. Required the Horary Angle, or apparent time from noon?