The 2012 Venus transit was the last chance to see this phenomenon for over 100 years. Mercury transits happen more often, the next one in 2032.

When Mercury transits the Sun, you can see it as a tiny black dot silhouetted against the Sun's disk.

Solar and lunar eclipses, why they occur, when the next eclipse is, and from where you can see them.

There are at least 2 solar eclipses each year. Find out when the next solar eclipse happens in your city and worldwide.