Comment on Chip Scale Atomic Clock (CSAC)parentComments−dreamcompiler5yAt sea the fact that "down" is perpendicular to the horizon is useful, because the horizon is pretty much a straight line. On land this is irrelevant because the horizon is rarely flat on land.
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At sea the fact that "down" is perpendicular to the horizon is useful, because the horizon is pretty much a straight line. On land this is irrelevant because the horizon is rarely flat on land.