An Investigation of all the Changes of the variable Star in Sobieski's Shield, from five Year's Observations, exhibiting its proportional illuminated Parts, and itts Irregularities of Rotation" with Conjectures respecting unenlightened heavenly Bodi.

(London, W. Bulmer and Co., 1805). 4to. No wrappers as extracted from "Philosophical Transactions" 1805 - Part II. Pp. 131-154 and 2 engraved plates. Clean and fine. First printing. Pigott is mainly known for his discovery of new comets and variable stars. "He was a frequent contributor to the "Philosophical Transactions"" his works therein include a number of importent papers on the method of observing stars with a transit instrument."(DSB).