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Published online by Cambridge University Press: 18 January 2010
It is some considerable time since the questions associated with irradiation were considered in the pages of the Journal. Indeed the interesting and practical paper by Captain Brett Hilder is the latest considerable contribution to the Journal and this appeared no less than twenty years ago. It is only in comparatively recent times that nautical astronomers have been provided with an authoritative irradiation correction of any sort. This, which applies only to observations of the Sun's upper limb, was incorporated in the altitude correction table for the Sun and appeared annually in the Nautical Almanac after 1953, the year of Hilder's paper, but was discontinued after 1969.