misreckoning

verb

1. (form-of, gerund, participle, present)present participle and gerund of misreckon

noun

1. A false reckoning; a miscalculation.

   “And if by such a meane we might provide for times to come, appoynting that after the revolution of such or such a number of yeares, that extraordinary day might for ever be eclipsed; so that our misreckoning should not henceforward exceede foure and twenty houres.”