astrophotography by bill w

if you look at the top of the planet, you get a hint of an angular structure at the north pole, rather than a circle, but i'm pretty su...

like the earth, the sun itself rotates.  its period is once every 24 days at the equator, but only once every 35 days at the poles.  this wa...

on 6/17/17 Jupiter put on a show: both io and ganymede transited jupiter's face while the great red spot was showing.  unfortunately, t...

variety pack of images: solar prominence 7/8/17 (occulted) Hydrogen alpha H alpha composite Ha exclusion Ha colorized com...

in testing a tracking mount for the eclipse, i encountered an unpleasant surprise: the sun is brighter in the summer!  so bright that the s...

finally able to take advantage of larger aperture for a higher magnification jupiter Jupiter 5/28/17 still a bit mushy, but showing so...

the bright star in the east after dark (which is pretty late these days) is in fact Jupiter.  seeing has been lousy this season, but i ...