Mercury is traveling across the sun

(CNN) - Mercury is gliding across the sun on Monday in an event called a transit.

It happens only 13 times per century, and the next one isn’t set to happen until 2049.

Mercury will look like a small black dot on the sun starting at around 7:35 a.m. EDT.

Its full path across the sun will take 5 1/2 hours.

Binoculars or a telescope will be needed to see the event. Attending a viewing party at a local museum or an astronomy club event is suggested since looking directly at the sun is harmful.

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