A Uranian hour is the same length as an Earth hour.  (This strange similarity of time-units is one of the few known instances of convergent cultural evolution.  Its cause is to be found in the future rather than the past, if Uranian philosophers are to be believed.  See mentality.)  Hence a Uranian day - being 30 hours - is 1.25 Earth days long. 

This is how the day is officially divided and its divisions named:

Hours 1 - 5:  morningshine

Hours 6-10:  ayshine

Hours 11-15:  evenshine

Hours 16-20:  anyne

Hours 21-25:  yyne

Hours 26-30:  pallyne

In addition there are, in popular descriptive usage, two important terms to denote those times when the stars are visible:

pmetn - approximately the last hour of pallyne and the first hour of morningshine

refelc - approximately the last hour of evenshine and the first hour of anyne

The air is at its brightest during the five hours of ayshine, and at its darkest - opaquely dark - during yyne, the darkest hour of night, when it obscures the Sun and stars, rendering the sky utterly black.  Midway between ayshine and yyne there are pmetn and refelc during which the throom is transparent, allowing some stars to be seen, even in the sunward hemisphere sky, except those that are right up close to the Sun's position.  (Of course it is only from Farside - in the starward hemisphere sky - that the heavens are revealed in all their true glory during pmetn and refelc.  That is a great part of the romance of the wilds of deep Fyaym.  Many voyagers have sought a proper sight of the stars.)


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