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Mercury Transits the Sun

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Just how big is the sun?
In the upper left corner of this image, tiny Mercury is barely visible as it passes in front of the sun.

Taken: 11/15/99
Equipment: 10" SCT f/6.5.  Thousand Oaks solar filter. Prime focus using a Minolta SRT-201.
Exposure: 1/60 second on Fuji Super G 800
Processing: Slight unsharp mask, color removal in PhotoShop.

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