It only takes 16 hours to rotate on its axis , so this means its day is shorter than a day on Earth.
(this; means; its day is shorter than a day on Earth) Context(this means,List([50, 60))):(its day; is; shorter than a day on Earth)
this means,List([50, 60))
this its day
means is
its day is shorter than a day on Earth
shorter than a day on Earth