why are moonrise durations uneven?

I've just noticed that the durations between one day's moonrise time
and the next day's moonrise time are not equal. Instead of a one-day
rise-time difference of say, 49 minutes, it varies in a regular two-
week pattern between 34 minutes and 64 minutes. Why? The moon orbits
the earth at a steady rate so the daily rise time difference should
always be the same (approximately 24 hrs X 60 minutes/hr / 29 days (in
one orbit)).
Anyone know the answer?

.

Relevant Pages

  • Re: why are moonrise durations uneven?
    ... and the next day's moonrise time are not equal. ... rise-time difference of say, 49 minutes, it varies in a regular two- ...
    (sci.astro.amateur)
  • Re: why are moonrise durations uneven?
    ... and the next day's moonrise time are not equal. ... rise-time difference of say, 49 minutes, it varies in a regular two- ...
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  • Re: why are moonrise durations uneven?
    ... and the next day's moonrise time are not equal. ... rise-time difference of say, 49 minutes, it varies in a regular two- ... Try calculating the moonrise times for a 30-day period as seen from a ... point on the Earth's equator. ...
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