In case anyone else is interested (and my apologies for polluting your
Alpine Linux thread), note that the Fourmilab site has a limit on the
rate that images that can be requested.  I exceeded this a couple of
times during testing, and instead of an image I was served up a file
that said I had exceeded the number of images that can be downloaded
within a 10 minute period.  At that point, in order to be 'unlocked',
you have to stop all requests for a while.

I found that one image per minute seemed acceptable, but overnight I was
again locked out - I'm guessing that small variations in the cron
interval meant that I had actually asked for 11 images in one 10-minute
period.  Anyway, the images seem to update by one pixel in just over 2
minutes, so I've adjusted my cron job accordingly.  It seems that the
syntax to run every second minute (1/2 * * * *) isn't supported by cron
under pCP, so instead I used 0,2,4,6,8...54,56,58 for the minutes.  So
far so good - not locked out yet.


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