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If you look closely at the top image of Detail from Hogarth’s Rakes Progress, depicting Bedlam, you will see a person standing next to the wall pondering the word “longitude” and drawings of the Earth and ships.

During the early 1730’s, British seafarers could only determine longitude by the method of taking “lunar distances”. This was a tedious method at sea. Having a reliable chronometer on board would have made celestial navigation easier to determine longitude but one did not exist.

John Harrison began his development of a maritime timekeeper at the same time Hogarth published this etching. However, it wasn’t until 1762 that Harrison’s fourth iteration of his chronometer proved reliable and successful, thus eliminating the need to take lunars.

Additionally, Hogarth may also have used the problem of solving longitude via lunars as a play on words based on the origin of the word “lunatic”.

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Garner David's avatar

Muslims must assimilate or relocate.. wake up UK

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