English: A simulated timelapse of the full moon appearing on or near Christmas day from 1711-2300 CE, with one frame for every 19th year according to the periodicity of the Metonic cycle. The embedded graph shows the shifting timing of full moon with December 25 in the middle, December 24 below, and December 26 above in a secular drift due to the fact that the 19-year period approximating the Metonic cycle is not exact.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.