Sun

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Sun

A unit of length in Japan equivalent to approximately 30 millimeters.
References in periodicals archive ?
The ratio of the intensity at an angle [theta] to intensity at the center of the star from limb darkening is expressed as follows [6]:
To further complicate the situation, any explanation of limb darkening for gaseous models would once again resurrect the solar opacity problem [42].
On Solar granulations, limb darkening, and sunspots: Brief insights in remembrance of Father Angelo Secchi.
Frank Very was the first to monitor the limb darkening of the Sun [12] as a function of frequency.
Limb darkening is explained by inferring the sampling of varying optical depths.
Ironically, Titan's low apparent surface brightness makes it easier to distinguish the limb darkening of its tiny disk.
In the satellites' inclined orbits, they also detected the effect of Venus's silhouette being projected slightly farther north or south on the solar disk, which changed the Sun's total brightness depending on the bit of the Sun that was hidden with limb darkening being taken into account.
For months O'Meara saw only the limb darkening of a disappointingly bland globe through the Harvard College Observatory's venerable 9-inch Clark refractor, until two brilliant spots suddenly appeared on the night of July 22, 1981.
Besides dark sunspots, bright active regions known as faculae, limb darkening, and some subtle granulation seen during good observing conditions, not much else is visible with white-light filters.
Several factors combine to create the fuzziness: diffraction and optical defects in the telescope, diffusion in the light-collecting system (be it the human eye, film, or a CCD chip), distortion and scattering in Earth's atmosphere, and solar limb darkening.
We did indeed find a slight black-drop effect despite the fact that Mercury has no atmosphere, and our observations were the first to demonstrate that the Sun's limb darkening contributes to the phenomenon.