Any class constructing an ObservingList needs to implement this to enable user actions to work.
Simplified button for use in the right hand panel of Hopper.
A collection of Button objects as a rectangular area on the screen.
The chart part of the main window of Hopper.
Observatory software to help with finding objects by star hopping.
12.2.23: First version
12.5.9: Mirror flip added.
12.11.21: Enabled selecting starting point from list of naked eye stars near the target.
12.12.3: Added IC catalogue.
Frame to hold the observing list table.
Holds data for the ObservingList table and manages saving them as a disc file (observinglist.csv) and reloading them .
Record to hold a label and its plotted position.