In October 1884 in Washington, U.S. President Chester Arthur hosted an international conference to discuss the choice of 'a ______ to be employed as a common zero of longitude and standard of time reckoning throughout the world'. What word fills in the blank?

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1. In October 1884 in Washington, U.S. President Chester Arthur hosted an international conference to discuss the choice of 'a ______ to be employed as a common zero of longitude and standard of time reckoning throughout the world'. What word fills in the blank?