Plate, method of determining parallactic motion by Thomas Galloway Diagram demonstrating how to determine a star's parallactic motion using the direction of the sun's motion, the star's position, and the location of the north and south poles of the equator. Subject: Astronomy Published in Philosophical Transactions as 'On the proper motion of the solar system'. Received by the Royal Society on 4 March 1847. Read 15 April 1847. [1847]