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Thesaurus: photoheliometer

A double-lens instrument for measuring slight variations of the sun's diameter by photography, utilizing the common chord of two overlapping images.

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Definitions

  1. A double-lens instrument for measuring slight variations of the sun's diameter by photography, utilizing the common chord of two overlapping images.
  2. A double-lens instrument for measuring slight variations of thesun's diameter by photography, utilizing the common chord of twooverlapping images.