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Limb darkening revealed that the solar photosphere was condensed, but not highly metallic.
As sub-components of the photosphere, the same mechanism invoked to understand limb darkening [section]2.
In a sense, with respect to thermal emission, each granule constitutes a mini-representation of the macroscopic limb darkening observed across the disk of the Sun (see [section]2.
Limb darkening is not observed, as was manifested in the visible spectrum (see [section]2.
The eminent British planetary observer David Gray has been able to convincingly replicate Comas Sola's more difficult observation of Titan's limb darkening against a dark sky background.
I encourage S&T readers to look for Titan's limb darkening now that Saturn and its largest moon are at opposition.
Sometimes it can even be seen outlined against the Sun's surface due to solar limb darkening.
Chapter 3 deals with techniques for observing sunspots, granulation, limb darkening, and faculae.
My 31-page booklet, Observer's Guide to the Transit of Mercury, 1999 Nov 15, has much more information about this event, including details of limb darkening at various wavelengths, maps of weather prospects and transit circumstances, a 38-item bibliography, and detailed predictions for 192 locations worldwide.
In addition to making it possible to view small sunspots, binoculars will show the limb darkening with greater ease than the naked eye alone.
Limb darkening really helps faculae stand out against the photosphere.