I showed the east west problem of the Belfast Muslims to an old sea captain acquaintance of mine (we were shipmates sixty years ago) and although he did not offer a solution he came up with the following:

Belfast to Mecca
Rhumb line: 133.2 deg true, 2913.5 nautical miles
Great circle: 115.1 deg true, 2874.9 nautical miles.

This raises the question for the faithful, when facing Mecca should one use the rhumb line or the great circle direction? Not much of a problem at the time of the Prophet but perhaps more important now!
Frank 55N 1W




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