Arago Spot in the Shadows of Celestial Bodies Recently, I've watched this video by Veritasium describing Poisson's Spot, or the Arago Spot. It is explained in the video that near circular (or spherical) objects can produce this optical effect, given that there aren't many obstructions about the circumference of the object to diffuse and scatter the light and the light producing the shadow is more or less in phase.  

My question is, Are Arago Spots possible/Have Arago Spots been observed in the solar shadows of any celestial bodies?
The Arago spot phenomenon requires the light source to be point-like and very bright. The sun is not a point-like light source, as it has an apparent diameter of about 0.5 degrees

The only body large enough to cast a full solar shadow is the moon.  Arago's spot has not been observed during a total solar eclipse.