Plotting realistic star charts
revised 2009 Dec 9Processing steps for astrophotographs
revised 2014 Dec 17Menus available on each image window
revised 2009 Oct 13How to subtract photos with GRIP
new 2007 Apr 9How to open RAW images in GRIP
revised 2007 Apr 10How to recombine colour channels with GRIP
new 2007 Apr 9How to measure the diameter of a pinhole
revised 2017 Jan 5How to estimate unknown magnitudes of stars
revised 2010 Feb 15