Posts tagged with ‘earth’s orbit’

  • This Day in History June 30, 1972

    By Ruth on June 30, 2013
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    I actually had never heard of today’s feature–nor had my mom.  Evidently, the earth’s orbit is somewhat irregular.  Atomic clocks, first appearing in the 1950’s, were extremely accurate, but these deviations in the earth’s orbit would eventually mean our time would be off by a second, then a minute, and eventually hours over the course of thousands of years.  And […]