Professional Telescope Calibrations Use…

How do the professionals calibrate their telescopes? By tracking a planetary transit of the Sun. Wow!

BEWARE: When they say “visible” they do NOT mean you can look up at the Sun at see it.

“Because we know Mercury‚Äôs size and location precisely, this transit will help scientists calibrate telescopes on solar observatories SDO, SOHO, and Hinode.”

Mercury In the Spotlight
nasa.tumblr.com

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