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of light shown by minor planets rather than
with the disc of Mars.
In 1888-9, at the Cape, he observed the
minor planets Iris, Victoria, and Sappho,
and secured the co-operation of four other
heliometers. His final result was 92,870,000
miles, the parallax being 8”,802 ( Cape Obs .,
Vol. VI.).
So delicate were these measures that Gill
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