Transit of Mercury in Front of the Sun
While this isn’t as rare as some of the other events on this list, it’s still one that doesn’t occur every month. The next transits of Mercury occur in 2032 and 2039. This transit occurs when Mercury crosses directly between the Sun and the Earth, blocking out a small part of the Sun’s rays. Mercury appears as a tiny black dot moving across the Sun.
Transits are rare in general, and cloud coverage can prevent you from seeing one. You need to use a telescope or a long lens to view this transit, with a pair of solar filters. Astronomer Tom Kerss said, “Although Mercury overtakes us several times per year on its relatively quick journey around the Sun, we don’t see transits every time, because Mercury’s orbit is quite highly inclined relative to that of the Earth. Fortunately, transits of Mercury are considerably more common than transits of Venus.” You’ll need to mark the date on your calendar to see the next one (RMG).