Page:Description and Use of a New Celestial Planisphere.pdf/41

36 pin falls on, in the horizontal line; as uppoe, if the Sun is near the Horizon, you put the pin in 2, or 3, on account of the obliquity of the hadow; but, if the Sun hath greater altitude, then place it in 4: and uppoe the hadow falls on 5, o have you a Rectangular Triangle, the Legs being formed by the Scales of equal parts, and the Sun's Rays is the Hypothenue; then work by this analogy, and, note! if the hadow falls between the diviions, then take the proportional part of the logarithms, and work as before, as if the hadow falls on 5$1/4$ parts, then take a quarter of the difference of the next les, and greater Arcs, and add it to the logarithm of the leer Arc, and work with it as in the lat Example; by which Rule you can never err a minute, either in the altitude or the time; and you may afely et the watch thereby. This Problem is univeral, and is of the utmot utility to the practical Navigator, as well as for the exercie and amuement of every private tudent, by land.

Problem 35. To regulate and adjut the motions of the Planets from noon, or midnight, as found in the Nautical Almanac, to any other intermediate hour and minute of the day or night required, and conequently to find their true places in the Zodiac, in the Planisphere, and their ituations, at all times, with repect to, and their progreive motion among the fixed