The sun appears to take a dizzying flip in a new video captured by NASA's Solar Dynamics Observatory (SDO) spacecraft .
SDO did a full somersault on July 6 over the course of about 7 hours, taking pictures of the sun every 12 seconds all the while.
These photos, which SDO team members combined into a video, are pretty wild.
The video seems "to show the sun spinning, as if stuck on a pinwheel," NASA officials wrote in an image description Friday (July 15).
The sun appears to do a somersault in these images captured by NASA's Solar Dynamics Observatory (SDO) spacecraft on July 6, 2016 — but SDO was the one doing the spinning.
The sun appears to do a somersault in these images captured by NASA's Solar Dynamics Observatory (SDO) spacecraft on July 6, 2016 — but SDO was the one doing the spinning.
Credit: NASA’s Goddard Space Flight Center/SDO/Joy Ng
SDO does such a somersault twice a year to help its Helioseismic and Magnetic Imager (HMI) instrument take good measurements of the sun's outer edge.
"Were the sun perfectly spherical, this would be a much simpler task. But the solar surface is dynamic, leading to occasional distortions," NASA officials wrote. "This makes it hard for HMI to find the sun’s edge when it’s perfectly still. HMI’s biannual roll lets each part of the camera look at the entire perimeter of the sun, helping it map the sun’s shape much more precisely."

http://www.space.com/33462-sun-somersault-photos-nasa-sdo.html