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    Thanks for visiting!

The site started in 1998. Back then it was only a few pages wrapped around the HaloSim halo simulation software.   It's still being extended with its sister site Optics Picture of the Day.   I've enjoyed putting the site together, learning more about the different sky phenomena while doing so and seeing your wonderful pictures.  It has been a privilege to include them on the site. 

Submit and image:
         Please read before mailing images
            Maximum 3 images - JPGs please. No ZIPs, RARs or RAWs. No links to large web archives for me to view.

Submitted the images elsewhere or thinking of doing so?   Please tell me. It is only courtesy. Would you like to waste two hours of your time writing an accurate explanation and making an attractive page only to have the its appearance pre-empted by the same or almost identical image popping up on another site and sometimes with poor science?   It is discouraging.

Publishing elsewhere does not stop an appearance. But tell me so that I can plan!  What you are guaranteed is a respectful treatment of your image, prominent credit, a thoughtful and accurate description/analysis and a permanent place in its galleries.
Or ask a question by mailing me.
Les Cowley
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