Time is usually reckoned by using what as a starting point?

Until the end of the Napoleonic Wars the Paris Observatory and Greenwich vied for the Prime Meridian. The defeat at Waterloo settled that and The Meridian zero degrees longitude runs through the Greenwich observatory. I terms of latitude Paris should on London time but the French refused and made Paris time one out earlier. GMT has now been renamed UTC. All spacecraft run UTC (contrary to American history book man first walked on the moon on July 21 1969 by spacecraft time. UTC is also called “Zulu Time” by many military and other organizations around the world to avoid confusion cause by location of summer hours.

Player #7719043, The answer is missing an I in meridian.

ZyggyStardust, Loopy

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spelled wrong!