A Lunar Crossing

NASA has a fleet of satellites that observe the Sun. Occasionally, the Moon moves between the Solar Dynamics Observatory and the Sun. That happened for about 1-1/2 hours on 6 August. While the view is obscured, some science data is lost, but some engineering data is gained. The sharp edge of the Moon’s limb provides an opportunity to measure how the satellite’s optics are diffracting light, and that information is used to maintain calibration for sharp imaging. This time lapse video compresses the event into 11 seconds.

[youtube https://www.youtube.com/watch?v=QrcNzAmgEhc]

Video Credit: NASA

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