Christmas full moon to arrive for 1st time since 1977

This year, when you look up at the sky on Christmas morning, you'll get a Christmas treat that no one has had since the year the original Star Wars movie was releaseda full moon.

The last full moon of 2015 will be at its fullest at6:11 a.m. ET on Christmas Day.

If you're younger than 38, this will be your very first Christmas full moon, since the last one wasin 1977.

It's taken sixStar Wars moviesfor the moon toskywalk back tofull illumination on a25th of December.The release ofStar WarsEpisode VII:The Force Awakens takes place on Dec. 14.

The next Christmas full moon is isn't expected until 3:54 a.m. ET in 2034, according to the U.S. Navy Astronomical Applications Department's moon phases predictor.

However, there will be a full moon on Boxing Day in 2017, which means the moon will look pretty close to full on Christmas Day that year.

Full moons fall on Christmas as often as they do on any other day of the year, but it's relatively rare for full moons to fall on any one day, whether it's Christmas or July 1 or your own birthday.

The moon becomes full every 29.5 days, or 12 to 13 times a year. But because the moon's cycle doesn't divide evenly into the number of days in our calendar year, the full moon(s) for a given month is shifted about 11 or 12 days per year. Next year's December full moon takes place on Dec. 14.