The Story Of Clocks And Calendars: Marking A Millennium by Betsy Maestro

The Story Of Clocks And Calendars: Marking A Millennium

Betsy Maestro

48 pages first pub 1999 (editions)

nonfiction history mathematics science informative medium-paced
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January 1, 2001, will mark the beginning of a new thousand-year period on earth. But our earth is more than four billion years old, and humans have lived on our planet for perhaps two hundred thousand years. So how can it be the year 2000? The ans...

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