Dear all,(adsbygoogle = window.adsbygoogle || []).push({});

It's late in the night and I have some trouble in deriving the expression of the ratio of the illuminated disk to the whole disk. Is it a formula "by definition" ?

See http://docs.google.com/viewer?a=v&q...vuuO5&sig=AHIEtbQ4C_gHumCJFdfEylxojg0t1MD6Vw" at page 16, figures 6 and 7.

It's written "Thus the ratio (...) can be expressed as [itex]f_i=\frac{1}{2}(1+\cos E_s)[/itex]" where Es is the phase angle.

Thanks for helping...

Jeff

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# Illuminated fraction of the Moon

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