If you have a copy of The British Mariner’s Guide, which contains a usable set of lunar tables, and a(n) __________, you can solve the longitude problem without a clock.

a) sextant
b) astrolabe
Consider This: John Harrison’s clock was very expensive to make and maintain. See 4.5: Narrative: The Globe on a Grid.
c) compass
Consider This: John Harrison’s clock was very expensive to make and maintain. See 4.5: Narrative: The Globe on a Grid.
d) spyglass
Consider This: John Harrison’s clock was very expensive to make and maintain. See 4.5: Narrative: The Globe on a Grid.


a) sextant

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