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We discuss how the solar occultations of bright sources of energetic gamma‐rays can be used to extract non‐trivial physical and astrophysical information, including the angular size of the image when it is significantly smaller than the experiment's angular resolution. We analyse the  egret  data and discuss prospects for other instruments. The  Fermi Gamma‐ray Space Telescope  will be able to constrain the size of a possible halo around 3C 279 from observations it makes on October 8 each year.

Gamma‐ray halo around 3C 279: looking through the Sun on the 8th of October