Mercury transit footage 2019,Nasa| Mercury transit 2019

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The most recent transits of Mercury occurred in 2016 and 2019. The next ones are expected in 2032 and 2039.
To view a transit of Mercury, one needs a telescope with a proper solar filter to protect the eyes from the Sun's damaging rays. Observing the Sun without protection can lead to permanent eye damage.

Historically, these transits have been of great importance to astronomers. They have been used to measure the distance from the Earth to the Sun