What many people may not realize, however, is that the sun is also rotating. It takes about 25 days for the sun to complete one full rotation at ... the more we can all learn.

“If you want to understand the Sun in its entirety, it is essential to look into all its layers simultaneously ... It shows the sun's rotation and material flow around sunspots on its surface.

All areas on Earth complete one spin in 24 hours. But it takes about 25 days for zones near the sun’s equator to finish one rotation and about 30 days for those near the north and south poles.

So why has the sun been rising later than it did on Dec. 21? Like much of our day and night cycles, the answer lies in Earth's rotation and ... or at the same speed all year.