Useful links for worldbuilders

[sandcastles]

Thanks for your comments. I checked a few of the dates that website gives for certain events. In some cases Stellarium's results are close, in some cases not close at all. So if I write a story which isn't consistent with what Stellarium shows, I hope you'll be tolerant?

I know we can write our own software program to use with Stellarium, but I haven't learned any current programming languages. Would I have to spend months learning the language before even beginning to write the program?