Reduce precision of "starvectors" test
Reduce precision of "starvectors" test

It looks like this test was unrealistically exact, and thus vulnerable
to tiny changes in IEEE floating point rounding.

exoanalytic/python-skyfield,exoanalytic/python-skyfield,skyfielders/python-skyfield,ozialien/python-skyfield,GuidoBR/python-skyfield,ozialien/python-skyfield,GuidoBR/python-skyfield,skyfielders/python-skyfield