A partial lunar eclipse of September's Harvest Moon Supermoon is happening tonight, and you can watch it online for free.
On Tuesday (Sept. 17), the Full Harvest Moon will experience a partial lunar eclipse that will be visible for North and South America (except for Alaska), Europe, most of Africa, western Asia, and parts of Antarctica. This eclipse will take place during a "supermoon," which will make the moon appear slightly larger in the night sky. This occurs when the moon is slightly closer to Earth, which happens because the moon's orbit is slightly elliptical, or oval-shaped.
