Paper, ['Observations on atmospherical refraction as it affects astronomical observations'] in a letter from S [Stephen] Groombridge to the Rev Nevil Maskelyne Subject: Astronomy Published in Philosophical Transactions as 'Observations on atmospherical refraction as it affects astro­nomical observations; in a letter from S. Groombridge, Esq. to the Rev. Nevil Maskelyne, D.D. F. R. S. Astronomer Royal. Communicated by the Astronomer Royal'. Written by Groombridge at Blackheath. Communicated by Nevil Maskelyne. Read 28 March 1810. Abstract published in Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London [later Proceedings of the Royal Society of London], Volume 1, 1832. 22 January 1810