Make names in ._utc() symmetric with other methods
Make names in ._utc() symmetric with other methods

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