 A Supermoon's Rilogy Presented by Science at NASA Mark your calendars. A series of three super moons will appear on the celestial stage on December 3, 2017, January 1, 2018, and January 31, 2018. A supermoon is a moon that is full when it is also at or near its closest point in its orbit around Earth. Since the moon's orbit is elliptical, one-side, apogee, is about 30,000 miles, 50,000 km, farther from Earth than the other, perigee. Nearby perigee full moons appear about 14% bigger and 30% brighter than full moons that occur near apogee in the moon's orbit. The super moons are a great opportunity for people to start looking at the moon, not just once, but every chance they have, says Noah Petro, a research scientist from NASA's Goddard Space Flight Center. It's hard for our eyes to distinguish these small changes in size when the moon is high amidst the vastness of the night sky, but any time you catch a full moon as it rises or sets, while it's suspended low on the horizon beaming through the silhouettes of trees or buildings, its apparent size might make you do a double take. You almost feel as though you could reach out, grab the glowing orb, and drop it into your coffee cup. Even more so if it's a supermoon. If you can catch only one episode of the supermoon trilogy, catch the third one. It will be extra special. First of all, the January 31st supermoon will feature a total lunar eclipse with totality viewable from western North America across the Pacific to eastern Asia. The moon's orbit around our planet is tilted, so it usually falls above or below the shadow of the earth. About twice each year, a full moon lines up perfectly with the earth and sun, such that the earth's shadow totally blocks the sun's light, which would normally reflect off the moon. The lunar eclipse on January 31st will be visible during moon set. Folks in the eastern United States where the eclipse will be partial will have to get up in the morning to see it, notes Petro, but it's another great chance to watch the moon. The moon will lose its brightness and take on an eerie fainter than normal glow from the scant sunlight that makes its way through earth's atmosphere. Often cast in a reddish hue because of the way the atmosphere bends the light, totally eclipse moons are sometimes called blood moons. We're seeing all the earth's sunrises and sunsets at that moment, reflected from the surface of the moon, says Sarah Noble, a program scientist at NASA headquarters. The moon, which is January 31st Supermoon, will also be the second full moon of the month. Some people call the second full moon in a month a blue moon. That makes it a super blue moon. Blue moons happen every two and a half years on average. With the total eclipse, it will be a royal spectacle indeed. A super blue blood moon. Sometimes the celestial rhythm syncs up just right to wow us. Heed your calendar reminders. On the three dates mark, step out into the moon set or moon rise and look up for a trilogy of sky watching treats. To learn more about the many wonders of the moon, go to moon.nasa.gov. For more on the many sky watching events to be found throughout the year, visit science.nasa.gov.