Lunar distance tables for finding longitude at sea · Publication of the First Nautical Almanac

The inaugural 1767 issue's distinctive feature was tabulated lunar distances, the first nautical almanac data dedicated to convenient longitude determination at sea.

The main distinctive feature of the inaugural issue for 1767 was the tabulation of lunar distances as a tool to facilitate the determination of longitude at sea from observations of the Moon. It was the first nautical almanac to contain data dedicated to the convenient determination of longitude at sea. Maskelyne built the work on Tobias Mayer's corrections for Leonhard Euler's Lunar Theory tables, and a companion volume of tables requisite for finding the latitude and longitude at sea supported its use.

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