The green companion to Antares should be looked for on the occasion of the Occultation on July 23rd 1893.
Dr Donaldson of Fergus stated that at 4.00 am on the 28th March 1893, he found the pair so easily divided by his 3.5 inch Cooke that he tried smaller apertures and was always successful in “clearly and distinctly” separating them until he reaches 2.5 inches, when “the green star was visible as a thickening of the diffraction ring
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