Plate, diagrams showing direction of comet and movement of earth by [James Ivory] Three diagrams showing the direction of the comet's motion and the movement of the earth in relation to the comet. Likely drawn by Ivory. Subject: Astronomy / Mathematics Published in Philosophical Transactions as 'A new method of deducing a first approximation to the orbit of a comet from three geocentric observations'. Communicated by Henry Brougham. Read 17 February 1814. [1814]