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If you own a Tuthill Polar Alignment finderscope then this free little utility written by Ray Porter is something you need. Thanks to this handy utility I have never even had to look at the Tuthill Polar Alignment scope’s rather complicated instructions.
This is a more modern version of an an old QuickBasic program also available as freeware on the internet.
Some important modifications have been made such as adjustment for longitude, daylight savings time, and time zone, but is still fast, light weight and very easy to use.
The program asks you for your date, earliest setup time, latest setup time, your longitude and time zone and does all the calculations for you. The results can be read and discarded or the report can be copied to the clipboard.
If you want a copy of TPACalc just send an e-mail to Ray Porter and he will e-mail you the program.