'Check that Greenwich time does not depend on self.location'

def test_gmst_independent_of_self_location(self):

    gmst1 = self.t1.sidereal_time('mean', 'greenwich')
    gmst2 = self.t2.sidereal_time('mean', 'greenwich')
    assert allclose_hours(gmst1.value, gmst2.value)
