I think that's a very good idea. I myself do not do celestial navigation - I put that code in at the request of a user. So I do not have a good idea about what features would actually be useful for celestial navigators. But I'm very happy to put stuff like this in the code, because it is functionality that I don't think exists in Stellarium et al., and more importantly it's exactly the type of code you want to have in an app that has been optimized for use without a cellular data connection. When writing an app like this you must ask yourself if you're really adding any value to the phone above what the user can get merely by using their web browser and Google search. Clearly things like offline celestial navigation will be of use to some people. Furthermore, the number of people who actually do celestial navigation is probably too small to grab the attention of commercial app writers (although no doubt someone has written such apps for iOS and Android by now).

I'll think about how to do this, and I may try to get comments from you about it before I implement the code. As I said, I don't do this myself, so I need some help to figure out what the user really needs. Also, the Hildon widget set doesn't really contain a good widget for entering floating point numbers, so details about data entry have to be thought about with some care.

b b b bump !

The Jolla device is now closer than it has ever been (not too risky to say so), at least for European people who preordered (like me). I really hope I'll be able to run Orrery on Sailfish someday, as I've not lost interest in your app!

Please don't give up the port plan, there are fans here! :]

Thanks for the very kind remarks. As long as I'm able to buy one of their phones somehow (I live in the US), I plan to port my little orrery app to it.

I have a problem with Orrery, it does not start anymore When started from terminal it says:
Wrong number (1) of numbers found on line 1 of /usr/share/orrery/orbitalElements/mercuryElements
However when I compare it to the same file on github it appears to be the same. uninstalling and re-installing also did not help. Any ideas anyone?

Puh
Li'l shock in the evening!
You are right that orrery throws such error on command line when trying to start with 'orrery'.
BUT solution is to just use the menu icon.
Or:
Then everything is fine

hmm, nope doesn't work for me. The app seems to start but disappears when started from the menu icon and when started from terminal with the command you gave it gives the same error (wrong number (1) ...etc.).

Did you really use full command given above?
I edited above post, copy full content and paste to terminal ...

Yes, the exact same
However there is a small change in the error message:
Wrong number (1) of numbers found on line 1 of /usr/share/orrery//orbitalElements/mercuryElements
(double // instead of single / when started with just "orrery" )

Well my Orrery, still works fine.
3.8.0-1