Downloaded the reference star finder from the Spectro-Aras site and not sure what to do with it?.I assume I enter the date, RA and Dec settings for a chosen target star and also my lat. and long. location then click on a `compute` button somewhere and up comes a list of reference A/B stars but nothing happens when I do that, have I missed something please?. Also what are all the different `site` buttons for ?
note – the above screen shows the default settings that came with the spreadsheet!
I can change the RA,Dec settings which changes the altitude but nothing else!