This item, by an unknown author, presents an astronomical sketch of eclipses, some of which could be seen from Philadelphia and Canton, China.

These volumes contain calculations and drawings of an eclipse of the sun, 24 June 1778, and of the moon, 29 May 1779, adjusted to the meridian of Philadelphia. There is also an incomplete duplicate of the calculations for the sun, and a duplicate of the calculations for the moon. An apparently personal reference in the text suggests that Freehauff was a native of Germany.

This item is a book of calculations, including problems in the elements of astronomy; the calculations of lunar eclipses at Philadelphia, 1747-1761, and of solar eclipses in 1744 and 1752; and Halley's tables of the sun and moon.