heliometer
heliometer[ˌhiːlɪˈɒmɪtə]noun- (Astronomy)a refracting telescope with a split objective lens, used for finding the angular distance between two stars
(天文)量日仪
语源- mid 18th cent.: from helio- 'of the sun' + -meter (because it was originally used for measuring the diameter of the sun)
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