adv. [f. prec. + -LY2.] In an astronomic or astronomical manner; according to astronomy or astronomic principles.

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1649.  Bp. Hall, Cases Consc., III. i. (T.). Images astronomically framed.

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1794.  Sullivan, View Nat., I. 219. Astronomically speaking, the greatest cold should be felt at the latter end of December.

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1856.  Kane, Arct. Expl., II. 404. The headlands … were generally determined astronomically.

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