From:
Thomas Young
To:
Sir John Herschel
Date:
[1829-5 or earlier]
Source of text:
RS:HS 18.353
Summary:
Measurement of moon's diameter and distance. Expects JH will soon have 'official authority over me' and [Nautical Almanac]. Astronomers probably regulate sidereal clock by variable equinox because they cannot find a fixed one. Errors in JH's equinoctial time.
Contributor:
John Herschel Project