Light travel time can be almost unchanged; see #526
Light travel time can be almost unchanged; see #526

The light travel time routine can survive almost unchanged if instead of
expecting NumPy broadcasting to make up for extra missing dimensions, we
add an extra dimension to the observer’s position before calling, to
avoid NumPy needing to do its own back-to-front dimension matching.

skyfielders/python-skyfield,skyfielders/python-skyfield