A treatise on the various lengths of the days, nights and twilights : with tables of latitude and longitude of the most eminent towns, harbours, headlands, and islands in the world ... / by Richard Mihill.

  • Mihill, Richard.
Date:
1755
Catalogue details

Licence: Public Domain Mark

Credit: A treatise on the various lengths of the days, nights and twilights : with tables of latitude and longitude of the most eminent towns, harbours, headlands, and islands in the world ... / by Richard Mihill. Source: Wellcome Collection.

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    OPERATION XXII. Elevate the fouth pole to the latitude, per table, and you will have the equator cut the meridian at 33 de¬ grees o minutes, the meridian altitude on the vernal equinox the 23d of September, and autumnal equinox on the 21 ft of March ; and the tropick of Capricorn cut the meridian at 59 degrees o minutes, which is the meridian altitude, on the 21ft of December, the fummer folftice ; and the tropick of Cancer to cut the meri¬ dian at 12 degrees o minutes, the meridian altitude, on the 21 ft of June, the winter folftice. EXAMPLE XXIII. Required, the fun’s meridian altitude, on the fummer and winter folftice, and on the vernal and autumnal e- quinoxes, at Gibraltar. OPERATION XXIII. Elevate the north pole to the latitude, per table, and the equator will cut the meridian at 54 degrees o mi¬ nutes, the meridian altitude on the vernal and autumnal equinoxes ; and the tropick of Cancer cut the meridian at 78 degrees o minutes, the fun’s meridian altitude on the fummer folftice; and the tropick of Capricorn cut the meridian at 34 degrees o minutes, the meridian alti¬ tude when on the winter folftice. F, X