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pyri, and inscribed bricks, dating back thou-
                                         sands of years.
                                            In attempting to appraise the efforts of
                                         the beginners we must remember that it
                                         was natural to look upon the earth (as all
                                         the first astronomers did) as a circular plane,
                                         surrounded and bounded by the heaven, which
                                         was a solid vault, or hemisphere, with its
                                         concavity turned downwards. The stars seemed
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