SDO lunar transit: now with video!

Bad Astronomy
The entire universe in blog form
Oct. 20 2010 8:46 AM

SDO lunar transit: now with video!

Yesterday I posted a beautiful image of the Moon transiting the Sun's disk as seen from the Solar Dynamics Observatory. Well, today NASA put up HD video of the event!

[It may take a minute to load, it's a big file.]

Phil Plait Phil Plait

Phil Plait writes Slate’s Bad Astronomy blog and is an astronomer, public speaker, science evangelizer, and author of Death From the Skies!  

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Wow! You can see the Sun's rotation over the four hour interval these pictures were taken, and then the Moon flashes by. The Moon is dark because it's between us and the Sun, so were seeing the unlit side (I have a diagram showing an approximation of the geometry of this event on my other page about it).

Moreover, scientists can use images of the sharp-edged Moon against the Sun's disk to check on the optics of the observatory. That information can be used to sharpen the images even more. So this is fantastic, fantastically beautiful, and fantastically useful, too.

Tip o' the sunglasses to NASAGoddard.