NOON INTERVAL TABLES

T. F. Hickerson

Abstract: The ancient method of determining the meridian altitude of the sun by a series of altitude observations, the maximum one of which was selected, may not be employed by ships in rapid motion when the course departs greatly from east and west, because the results of observation are vitiated by the change in altitude caused by the motion in latitude of the ship itself during the observations. In this situation, Todd’s method1 is commonly employed: from the dead-reckoning longitude of the ship and the Greenwich civil time at a selected morning moment, the time interval until local apparent noon at the moving ship is computed. At the end of this interval the sun is observed on the meridian.
Published in: NAVIGATION, Journal of the Institute of Navigation, Volume 1, Number 1
Pages: 17 - 19
Cite this article: Hickerson, T. F., "NOON INTERVAL TABLES", NAVIGATION, Journal of The Institute of Navigation, Vol. 1, No. 1, 1946, pp. 17-19.
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