FW: Full Moon Cycle RE: Cycle of Maximum Lunations

classic Classic list List threaded Threaded
1 message Options
Reply | Threaded
Open this post in threaded view
|

FW: Full Moon Cycle RE: Cycle of Maximum Lunations

Karl Palmen
Dear Tom, Irv, Victor and Calendar People

Here is my original note about the "full moon cycle".

Karl

-----Original Message-----
From: Palmen, KEV (Karl)
Sent: 23 September 2002 08:59
To: 'East Carolina University Calendar discussion List'
Subject: Full Moon Cycle RE: Cycle of Maximum Lunations

Dear Tom and Other Calendar People

> -----Original Message-----
> From: Tom Peters [mailto:[hidden email]]
> Sent: 20 September 2002 19:24
> To: [hidden email]
> Subject: Re: Cycle of Maximum Lunations
>
>
> On Fri, 20 Sep 2002, Palmen, KEV (Karl) wrote:
>
> > Please use ISO date standard yyyy-mm-dd
> > or give the name of the month (e.g. Jan 4, 1601).
> > We use dd/mm/yy in Europe which can be confused with the
> > U.S. mm/dd/yy.
>
> Hear, hear!
>
> > The pattern seems to follow the full moon cycle, which
> > usually has 14
> > months.
>
> What do you mean by that 14-month Full Moon cycle?

On 12 August this year I sent to CALNDR-L :

------------------------------------------------------------------

Dear Victor and Calendar People

> -----Original Message-----
> From: Engel,Victor S [mailto:[hidden email]]
> Sent: 09 August 2002 16:06
> To: [hidden email]
> Subject: Re: Calendar Numbers
>
>
> 14: lunar months in a full moon cycle (approx)
>
> What cycle is this referring to?
>
It's the cycle in which the lunar perigee move backwards through the phases of the moon.

I call it the full moon cycle, because it its the cycle in which the full moon oscillates in apparent size and in time of the lunation (age).

The cycle follows the sequence

Full moon big
Full moon early
Full moon small
Full moon late

I don't know of any other name for this cycle.
Does any other calendar person know of a name for this cycle?

The following shows the oscillation in the moon age:

Lunar Calendars and Eclipse Finder 3.54
http://hermetic.magnet.ch/lcef/lcef.htm

Search for next full moon.
2002-03-28 CE 18:24 (local = GMT)
lunat. and age = [27] 14 days, 16 hrs, 22 mins (49.4%).

Search for next full moon.
2002-04-27 CE 02:59 (local = GMT)
lunat. and age = [28] 14 days, 7 hrs, 38 mins (48.3%).

Search for next full moon.
2002-05-26 CE 11:51 (local = GMT)
lunat. and age = [29] 14 days, 1 hr, 6 mins (47.5%).

Search for next full moon.
2002-06-24 CE 21:42 (local = GMT)
lunat. and age = [30] 13 days, 21 hrs, 55 mins (47.3%).

Search for next full moon.
2002-07-24 CE 09:06 (local = GMT)
lunat. and age = [31] 13 days, 22 hrs, 41 mins (47.5%).

Search for next full moon.
2002-08-22 CE 22:29 (local = GMT)
lunat. and age = [32] 14 days, 3 hrs, 14 mins (48.2%).

Search for next full moon.
2002-09-21 CE 13:59 (local = GMT)
lunat. and age = [33] 14 days, 10 hrs, 49 mins (49.3%).

Search for next full moon.
2002-10-21 CE 07:19 (local = GMT)
lunat. and age = [34] 14 days, 20 hrs, 2 mins (50.5%).

Search for next full moon.
2002-11-20 CE 01:33 (local = GMT)
lunat. and age = [35] 15 days, 4 hrs, 59 mins (51.6%).

Search for next full moon.
2002-12-19 CE 19:10 (local = GMT)
lunat. and age = [36] 15 days, 11 hrs, 35 mins (52.4%).

Search for next full moon.
2003-01-18 CE 10:47 (local = GMT)
lunat. and age = [37] 15 days, 14 hrs, 24 mins (52.7%).

Search for next full moon.
2003-02-16 CE 23:51 (local = GMT)
lunat. and age = [38] 15 days, 13 hrs, 2 mins (52.4%).

Search for next full moon.
2003-03-18 CE 10:34 (local = GMT)
lunat. and age = [39] 15 days, 7 hrs, 59 mins (51.6%).

Search for next full moon.
2003-04-16 CE 19:35 (local = GMT)
lunat. and age = [40] 15 days, 0 hrs, 16 mins (50.5%).

Search for next full moon.
2003-05-16 CE 03:35 (local = GMT)
lunat. and age = [41] 14 days, 15 hrs, 21 mins (49.3%).


Karl Palmen


05(06(03 till noon

-----------------------------------------------------

The actual mean length of the full moon cycle is

1/(1/A - 1/S) = SA/(S-A)

where A is the length of the anomalistic month
and S is the length of the synodic month.

Using wikipedia figures
http://www.wikipedia.org/wiki/Month

I get
29.5305888*27.55455/1.976038 = 411.785 days
27.55455/1.976038 = 13.94434 synodic months

Karl Palmen


05(07(16 till noon