From the MC Bookshelf

Author Eric Burgess started a user’s group after being flooded with modifications to his Apple II programs in Celestial Basic: Astronomy on Your Computer. Burgess has just finished work on a sequel. In More Uses for Your Timex/Sinclair 1000: Astronomy on Your Computer, Burgess was able to “use many of the suggestion from the Celestial Basic user’s group,” he said.