- Update to 1.48
* Times now support the ``<`` operator, so Python can sort them.
* For convenience, geoids like :data:`~skyfield.toposlib.wgs84`
have a new attribute
:data:`~skyfield.toposlib.Geoid.polar_radius`.
* You can no longer subtract two positions unless they have the
same ``.center``. Otherwise, a ``ValueError`` is raised. This
check has always been performed when you subtract vector
functions, but it was missing from the position subtraction
routine.
* On days that the Sun fails to rise and set in the Arctic and
Antarctic, the new rising and setting routines now correctly
set the value ``False`` not only for sunrise but also for
sunset.
- Reenable pytho312 testing with a new assay