Sun

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Sun

A unit of length in Japan equivalent to approximately 30 millimeters.

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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. Changes that were reported were extremely tiny and depended confusingly on the technique used, the wavelength of light observed, and exactly how the Sun's "edge" was defined.

The rock-steady size of the sun

These solar eclipse observations in turn are used to measure small but climatically significant variations in the solar diameter, but their use for this purpose is limited by our current knowledge of lunar topography."

The moon hits the bull's eye again

At three locations near Agra, teams for the International Occultation Timing Association measured the solar diameter to detect possible variations.

When Rahu devoured the Sun

That's about two solar diameters. Binoculars will help.

Eclipse, at last: the "Great American" total solar eclipse is this month's star attraction

The model predicted the existence of almost 10 times more objects on orbits that approach the Sun to within 10 solar diameters than the researchers actually observed.