Some believe that Stonehenge (2500 BCE) in England was built to help establish when the Summer Solstice occurred.
Males and Females sleep up to 18-20 hours a day in most cases. Depending on how hot or if the weather is perfect than the lion will sleep. If the weather is good ther will sleep about 14-18 hours and go hunting or playing.
The Lion sleeps just about any time he wants. Animal Kingdom hours are fairly stable compared to The Magic Kingdom. The park opens at 9:00 every morning and closes between 5 and 8 pm. Most of the year it's 5:00, but during the busy times it will run clear up to 8:00.