Coaxial day/night and moonphase watch sub-dial
Proposal for sub-dial that shows both Day/Night (AM/PM), and also the current phase of the moon. Differences from traditional moonphase sub-dial:
	(1) The moons are not on a disk but are two circles attached to opposite sides of an axis. This "foreground only" moons piece rotates, like a traditional moonphase disk, 360 degrees in 59 days.
	(2) Beneath the moons as described in #1, is a coaxial disk which rotates 360 degrees once each 24 hours, and is colored to represent bright daylight sky on one side (white or light blue), dark night sky (black or midnight blue) on the other side, and graduated coloring from dark to light and light to dark where the opposites meet (graduated gray or blue).
	(3) The cutout in the watch dial might be slightly larger than the size of the moons, to provide border space in which a little extra of the 24 hour sky disk underneath the moon is visible.
The moon shows the same as in a traditional moonphase complication (See example, below). But the sky behind the moon (the "background") changes thru a 24 hour daily cycle: all dark in the middle of the night, gradually becoming lighter toward morning, all light at midday, and gradually becoming darker toward evening....
See: detail design sheet
	http://www.cloud9.net/~bradmcc/sq/DayNightMoon.html Copyright © 2004 Brad McCormick, Ed.D. bradmcc@cloud9.net (2006-06-03 ISO 8601) 03 June 2006CE v01.09
Example moonphase sub-dial (also has coaxial day of month hand; Patek Philippe ref. 5054)