A nearby prehistoric moon observatory built by the Hopewell Indian in Newark, Ohio is celebrating the northern-most position of the moon in its 18 year cycle.
I have not been able to find much information about this moon cycle. I thought it would make a good topic for APOD.
18 year moon cycle
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http://www.mythicalireland.com/astronom ... cycle.html
http://scienceworld.wolfram.com/astrono ... ycles.html
Here's a couple easy-read sites to add to your info base.
http://scienceworld.wolfram.com/astrono ... ycles.html
Here's a couple easy-read sites to add to your info base.