Dear Calendar People
I’ve decided to check my full moon cycle calendar at
http://the-light.com/cal/kp_fumocy_q.txt against the current supermoon and find the supermoon is 5 days later than the start of a full moon cycle according to the calendar.
I found that the Wikipedia Supermoon page links
https://www.fourmilab.ch/earthview/pacalc.html which calculates lunar perigee times, moon distance and the time to the nearest full moon or new moon in days and hours.
From this I found that this supermoon had the full moon 2 hours past the perigee and others in recent years were nearer to perigee.
This supermoon was the last of seven full moons with 3 hours of perigee occurring once every 14 lunar months.
Perigee Date Full moon diff Date of New full moon cycle in calendar
2010-01-30 +2 hours 2010-02-04 (5 days late)
2011-03-19 +0 hour 2011-03-22 (3 days late)
2012-05-06 -0 hour 2012-05-07 (1 day late)
2013-06-23 -0 hour 2013-06-23 (same day)
2014-08-10 -0 hour 2014-08-09 (1 day early)
2015-09-28 -1 hour 2015-09-24 (4 days early)
2016-11-14 -2 hours 2016-11-09 (5 days early)
This table shows that my Full Moon Cycle (Fumocy) calendar is well aligned.
The bigger supermoon 68 years ago was 4 hours different from perigee. The changes in eccentricity of the moon’s orbit cause to biggest supermoons not to normally be the full moon nearest to perigee.