Out of combat, AC to Solar.
Cast HT making sure you have DoC buff.
~2 sec before pull, pre-pot & starfall.
Starfire spam until 1st starfall fades
Continue starfire spam
Wrath -> 1 cast from lunar -> NS+HT for DoC
Wrath -> Lunar
Starfall again (3rd)
Normal rotation, continue to cast 1 HT before your next eclipse.
Dream of Cenarius buff lasts ~29 sec after the HT cast, so just keep practicing the rotation and you'll shortly find out the best time for you to cast HT. It all depends on player skill and how "in sync" they are with the rotation.
I find myself casting HT when I have meta up. But always always make sure every eclipse is DoC-empowered.