There is no Leap year, Julian, Sidereal, Tropical, Anomalistic, Draconic, Lunar, Vague, Heliacal, Sothic, Gaussian, Besselian, Galactic year... without Weekes.
Mr. Ross added: "I was initially a little puzzled by its anomalistic nature.
On Twitter he is @chriscfrench Anomalistic Psychology: Exploring Paranormal Belief and Experience by Chris French and Anna Stone will be published in November 2013.
An anonymous 3rd-century commentary on Ptolemy attributed to Kidinnu the discovery that 251 synodic months = 269 anomalistic months.
Thus, the Moon's distance from Earth is the same after a whole number of anomalistic months and very nearly the same after one saros.
This phenomenon has a special place in the history of "anomalistic psychology" in so far as it attracted the attention of Michael Faraday, the famous English physicist.
The test was thought up by Professor Chris French, head of the anomalistic psychology research unit at Goldsmiths College London, and will be hosted by the Mersyside Skeptics Society.
The anomalistic month (about 27.555 days) is the average time from the moment of the Moon's quickest motion through the stars to the next moment of quickest motion.
The group behind the challenge has enlisted Professor Chris French, head of the anomalistic psychology research unit at Goldsmith's, University of London, to design and conduct the experiment, which, if Morgan attends, will be hosted by the Merseyside Skeptics Society in Liverpool.
But in a result they perhaps should have seen coming, the pair were only successful in identifying characteristics of the volunteers at a rate of one in five, an outcome "entirely consistent with the operation of chance alone," according to Professor Chris French, of the university's Anomalistic Psychology Research Unit and organiser of the study.
