description Nevil Maskelyne Overview
Nevil Maskelyne was the fifth British Astronomer Royal, serving from 1765 to 1811. He significantly advanced maritime navigation by developing the lunar distance method for determining longitude at sea. To support this method, he published the first Nautical Almanac and Astronomical Ephemeris in 1766. He also conducted the Schiehallion experiment to measure the average density of the Earth.
help Nevil Maskelyne FAQ
How did Nevil Maskelyne help sailors determine longitude?
Maskelyne promoted the lunar-distance method, in which navigators measured the Moon's angular distance from another celestial body. They could compare that observation with tables in the Nautical Almanac to calculate Greenwich time and therefore longitude.
What was Maskelyne's role in the Nautical Almanac?
After becoming the fifth Astronomer Royal in 1765, Maskelyne established its regular production. The first edition was issued in 1766 with astronomical tables prepared for the year 1767.
Was Nevil Maskelyne an opponent of John Harrison's marine clock?
Maskelyne tested Harrison's H4 timekeeper on a voyage to Barbados and later evaluated longitude proposals as a Board of Longitude commissioner. Their methods competed, but practical navigation ultimately used both marine chronometers and astronomical observations.
What did Maskelyne measure at Schiehallion?
In 1774 he measured how the Scottish mountain Schiehallion deflected a plumb line through its gravitational attraction. The results allowed scientists to estimate Earth's mean density and, indirectly, its mass.
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