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From: Veikko M{kel{ (PVTMAKELA_at_hidden_email_address.net)
Date: 11/14/1996

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> I must disagree here a bit. The opposition effect on moon is only partly
> caused by disappearance of shadows. There is also significant
> contribution from coherent backscattered light due to multiple
> scattering at the lunar surface.

  The opposition effect or "dry heiligenschein" on ground is caused   only by disappering shadows, I guess. This effect is seen often   seen on cutted field (seen as a light pillar better than only   brightning around anti-solar point), on sandy ground or on forest   area observed from plane.

                                                    -VeikkoM-

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