Sun

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Sun

A unit of length in Japan equivalent to approximately 30 millimeters.
References in periodicals archive ?
when the comet will whip around the Sun less than one solar diameter from the Sun's surface.
It will fly less than one solar diameter past the Sun's visible surface, with the dusty ice of the comet's nucleus broiling violently.
S&T readers joined expeditions to determine the precise edges of solar eclipses back when this was the state of the art for measuring the solar diameter.