On Dec 10, 2013, at 1:50 AM, Jack Jones <telescoper@xxxxxxx> wrote: > What year was that, I wonder? According to Phil Harrington, the effect was > named "the Lunar X" in 2004 by David Chapman, a Canadian amateur. from <http://the-moon.wikispaces.com/Lunar+X> It is unknown when or by whom the "X" feature was first observed. The following are the dates when the "X" was first noticed by various observers who later became interested in it: Observer Date Bill Busler June 1974 Dana Thompson June 1978 David Chapman August 2004-- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.