Ahh Nutation? Are you perchance an astronomer?

Cheers

Wally wrote:

Navigator wrote:


... "is the period from rise to set at a
fixed location constant?"


No. See other post.



... Is it constant at a fixed location on the same day
each year? If not why?


No, because the number of lunar months in a year is not a whole number. Even
if it were, the period would likely still vary year-on-year due to the
nutation period of the moon's orbit, which causes a variation in the
azimuths of the northern and southern standstills (and the rise/set points
in between).