A second version of Airy's 1868 ToV observing map showing some locations for possible Canadian stations. This copy is from the relatively rare Correspondence Between the Treasury, the Admiralty, and the Astronomer Royal, Respecting the Arrangements to be Made for Observing the Transits of Venus, Which Will Take Place in the Years 1874 and 1882 printed in the House of Commons Parliamentary Papers XLVII (1869). Image courtesy of Specula astronomica minima (©Specula astronomica minima).
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