A page from a manuscript titled “Plain Astronomy,” which is a volume of notes on practical astronomy and mathematics, likely from the period of 1780-1825.

A page from a manuscript titled "Plain Astronomy," which is a volume of notes on practical astronomy and mathematics, likely from the period of 1780-1825.

A page from a manuscript titled “Plain Astronomy,” which is a volume of notes on practical astronomy and mathematics, likely from the period of 1780-1825.