B How hard is it to track moon cycles

DaveC426913

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Otherwise the pattern calendar months should make, given that they have either 29 or 30 days, are called yerms. Here is a 17-month yerm;
Interesting. Citation?

I only find two references to this term via Google, involving a guy named Karl Palmen. One as a Wiki article and references the other, and the other says he invented the term himself.

https://www.hermetic.ch/cal_stud/palmen/yerm1.htm
 
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I only find two references to this term via Google, involving a guy named Karl Palmen.
Yes, Karl came up with the term "yerm". I have corresponded with him.
The yerm is any alternating pattern like that, which begins and ends with a 30 day month. The 17-month yerm has 502 days, so you can see that its average is best for a single yerm.
 

DaveC426913

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.. are called yerms.
OK. Are they called yerms by more than two people?

Because if you're going to bring unfamiliar terms into it, you gotta expect people are going wonder why they're never heard of them and can;t find a reference for them. Just sayin'
 
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@DaveC426913 The term was used for years on a calendar forum I was on. There won't be that much mention of yerms on the internet at large. It seems no has written a book on the subject. It's just a name for the apparent groupings that form when months are mapped out, evenly spread.
Karl claimed that Issac Newton already knew about the 3 yerm pattern of 1447 days;

30 29 30 29 30 29 30 29 30 29 30 29 30 29 30 29 30
30 29 30 29 30 29 30 29 30 29 30 29 30 29 30
30 29 30 29 30 29 30 29 30 29 30 29 30 29 30 29 30

for some calendar he invented.
 

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