add the moon's track on the sky to the observing example
add the moon's track on the sky to the observing example

kelle/astropy,funbaker/astropy,bsipocz/astropy,stargaser/astropy,dhomeier/astropy,StuartLittlefair/astropy,dhomeier/astropy,stargaser/astropy,aleksandr-bakanov/astropy,funbaker/astropy,stargaser/astropy,astropy/astropy,MSeifert04/astropy,MSeifert04/astropy,AustereCuriosity/astropy,pllim/astropy,astropy/astropy,lpsinger/astropy,kelle/astropy,MSeifert04/astropy,dhomeier/astropy,AustereCuriosity/astropy,mhvk/astropy,dhomeier/astropy,StuartLittlefair/astropy,MSeifert04/astropy,astropy/astropy,stargaser/astropy,mhvk/astropy,pllim/astropy,bsipocz/astropy,astropy/astropy,larrybradley/astropy,funbaker/astropy,lpsinger/astropy,kelle/astropy,pllim/astropy,kelle/astropy,AustereCuriosity/astropy,DougBurke/astropy,AustereCuriosity/astropy,lpsinger/astropy,saimn/astropy,pllim/astropy,aleksandr-bakanov/astropy,aleksandr-bakanov/astropy,DougBurke/astropy,bsipocz/astropy,astropy/astropy,pllim/astropy,dhomeier/astropy,DougBurke/astropy,larrybradley/astropy,saimn/astropy,StuartLittlefair/astropy,bsipocz/astropy,saimn/astropy,saimn/astropy,DougBurke/astropy,mhvk/astropy,mhvk/astropy,funbaker/astropy,aleksandr-bakanov/astropy,larrybradley/astropy,kelle/astropy,AustereCuriosity/astropy,lpsinger/astropy,mhvk/astropy,larrybradley/astropy,saimn/astropy,StuartLittlefair/astropy,lpsinger/astropy,larrybradley/astropy,StuartLittlefair/astropy