Finally I managed to install mephemeris and I tested the application. It is a nice application, but clearly unfinished, looking like a beta application.

What I like:

- clear self-explanatory buttons what to do or refresh
- sky chart with different display options

What I dislike:

- no configuration / settings screen. The user has to edit /usr/lib/mephemeris/mephemeris.ini by hand.
- when opening 'sky' it opens a sky map with lots of option buttons but when the user clicks a button nothing happens. There is nothing such as a 'refresh' or 'apply' button.
- when the location is updated (in this form the text fields are too small to fit the letters/digits whic render unreadable text)
and the application is restarted it resets to the value in the ini file
- it includes 'Pluto' in the planets. Why include such a faint dwarf planet ?

Conclusion:

Nice application but it has to be finished yet.