something relating to Astronomy.

Astronomical Calendar, an instrument engraved on copper plates, printed on paper, and pasted on a board, with a brass slider carrying a hair; it shows by inspection the sun's meridian altitude, right ascension, declination, rising, setting, amplitude, &c. to a greater degree of exactness than the common globes.

Astronomical Sector, a very useful mathematical instrument, made by the late ingenious Mr Graham; a description of which is given in the course of the following article.