When Mercury or Venus passes in front of the disk of the Sun, we call this

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When Mercury or Venus passes in front of the disk of the Sun, it is called a transit. This is different from an eclipse, which occurs when the Moon passes between the Earth and the Sun, blocking the light of the Sun from reaching the Earth. An occultation occurs when one astronomical object passes in front of another, obscuring it from view. A shadow event is not a common astronomical term.

When Mercury or Venus Passes in Front of the Disk