Venus will pass between the Earth and the Sun ..

A transit of Venus occurs when the planet Venus passes directly between the sun and earth. Observers in the northern hemisphere will see Venus appear to move from left to right across the upper half of the Sun at a slight downward angle.

According to experts at the NASA Goddard Space Flight Center, "Transits of Venus across the disk of the Sun are among the rarest of planetary alignments." They're so rare, in fact, that only seven such events have occurred since the invention of the telescope (1631, 1639, 1761, 1769, 1874, 1882 and 2004.)

[link to www.nationalparkstraveler.com]

Once in your lifetime event :)