I wrote sunwait in 2000, and abandoned it in 2004. Someone asked me about it recently and I promised I'd move it to GitHub to make the code more collaboration-friendly. So I stood up a repo on GitHub at https://github.com/risacher/sunwait I also pulled in the bugfix suggested by Phos Quartz in December 2018 and I implemented the 'solarnoon' feature that someone asked for in 2017. (That's in a branch for now, since I want to test it a bit more: https://github.com/risacher/sunwait/tree/solarnoon )