In the Journal of the Royal Institute of Navigation there has been a few
articles about 'Comlumbus's Method of determining longitude' by Keith A.
Pickering and some reaction.
They are in the Journals
vol.49 (1996), p.444
vol.49 (1996), p.101-103
vol.49 (1996), p.109
vol.50 (1997), 144-147

and in: 'Terrae Incognitae'
vol.24, p.68-69 (1992)
vol.15, p.102-104 (1983)

and in: 'The Mariners Mirror' 81:4, p.403

in short: "....Columbus used the Ephemerides of Johann Mueller".
and: "Columbus often asserted that a degree of the Earth's circumference
was 56 2/3 miles, or 14 1/6 leagues, and most now accept that
Comlumbus'sleague was less than three nautical miles".


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Thibaud Taudin-Chabot
52°18'19.85" North  04°51'09.45" East
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