The November full moon—known as the “Beaver Moon”—this year will coincide with the longest partial lunar eclipse of the century. As the chill of autumn grows colder, and days grow shorter, the nearing of winter solstice harks a time when trap setters once sought to subdue those large rodents, beavers, and procure their pelts to keep warm in the months ahead. On the night of November 19, a full moon named after that dam-building mammal brings with it a celestial phenomena: a “partial lunar eclipse,” where the Moon will be almost completely obscured by the Earth’s shadow. Here’s what you need to know about the Full Beaver Moon and its coinciding lunar eclipse: What are lunar eclipses? Lunar eclipses only occur during full moons, when the sun and moon are on near opposite sides of the Earth and a terrestrial shadow is cast upon the lunar surface. There are three …