The Marquis Malvasia in his Ephemerides (Bologna, 1662) describes a micrometer of his own invention. [Please select]
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This diagram, ignoring the curved lines actually marked on it, may be used over and over again for any number of eclipses, simply noting from the _Nautical Almanac_ or other suitable ephemerides the points on the Moon’s disc at which the shadow first touches the disc as it comes on, and last touches the disc as it goes off. [Please select]
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