Add earth_rotation_table ScienceState to IERS.
Add earth_rotation_table ScienceState to IERS.

astropy/astropy,MSeifert04/astropy,saimn/astropy,StuartLittlefair/astropy,mhvk/astropy,dhomeier/astropy,StuartLittlefair/astropy,dhomeier/astropy,aleksandr-bakanov/astropy,stargaser/astropy,StuartLittlefair/astropy,larrybradley/astropy,StuartLittlefair/astropy,dhomeier/astropy,larrybradley/astropy,stargaser/astropy,saimn/astropy,StuartLittlefair/astropy,stargaser/astropy,mhvk/astropy,aleksandr-bakanov/astropy,MSeifert04/astropy,pllim/astropy,dhomeier/astropy,aleksandr-bakanov/astropy,astropy/astropy,lpsinger/astropy,dhomeier/astropy,lpsinger/astropy,lpsinger/astropy,saimn/astropy,pllim/astropy,pllim/astropy,larrybradley/astropy,MSeifert04/astropy,larrybradley/astropy,saimn/astropy,astropy/astropy,MSeifert04/astropy,lpsinger/astropy,larrybradley/astropy,astropy/astropy,saimn/astropy,pllim/astropy,mhvk/astropy,lpsinger/astropy,astropy/astropy,mhvk/astropy,stargaser/astropy,pllim/astropy,aleksandr-bakanov/astropy,mhvk/astropy