a new approach for X

David and I have been chatting about Lunar X via Facebook. One message gave me pause.

The X is very regular, but it is the civic calendar that is not.  There will be months with two events, most with one event, and the occasional February with no event.  Rather than going through the calendar month by month looking for events, just work out the Julian date of the events and see what month and day they fall in.  Use a more precise value for the advance of the colongitude.

Maybe I was going about this the wrong way...