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    The Transit of Mercury, 1868, November 4.—The second internal contact at this transit was well observed in many European observatories, though at others the bad definition and tremulousness of the sun' limb vitiated the results. If we calculate strictly from Leverner's tables of sun and planet, with Prof. Newcomb's value of the mean solar parallax, 8″.848, we shall have the following formula for reduction of the observed Greenwich mean time at any place to the centre of the earth: —

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