As we mentioned a few weeks ago, tonight is the last so-called "Blue Moon" until 2015. (The term is for when a month has two full moons, and the second full moon is the Blue Moon—hence "Once in a blue moon" being a rare occurrence.) And NASA wants everyone to remember astronaut Neil Armstrong, the first man on the moon, tonight. The space agency said today:

There is a Blue Moon today, coinciding with a private family memorial service for Neil Armstrong, the first man to walk on the moon. In honor of Neil, NASA’s asking that you share publicly your photos of the moon tonight on Google+ and tag them with the hashtag #WinkAtTheMoon . NASA will repost a gallery on the +NASA page of some of our favorite photos.

After Neil’s passing, his family stated: “For those who may ask what they can do to honor Neil, we have a simple request. Honor his example of service, accomplishment and modesty, and the next time you walk outside on a clear night and see the moon smiling down at you, think of Neil Armstrong and give him a wink.”

Mark your calendars: There are DOUBLE blue moons in 2018.