<blockquote>The first eclipse of 2018 will be a lunar one that comes at the very end of the month, on Jan. 31.

It will be a total eclipse that involves the second full moon of the month, popularly referred to as a Blue Moon. Such a skywatching event hasn't happened for more than 150 years.</blockquote>
via <a href="https://www.space.com/39241-first-blue-moon-total-eclipse-150-years.html">First Blue Moon Total Lunar Eclipse in 150 Years Coming This Month</a>.