Calender System and Local Astronomy

Since I'm going to be explaining Composia and its lore, this seems like as logical a place as any to begin; a description of the common dating system and the cosmic items they take their basis from.

Firstly, Composia is a planet with an axial tilt giving it seasons much like the Earth's, these vary based on its solar orbit, which has a peroid of 300 days, which is the composian year.  Also similarly to Earth, Composia's months are based on lunar cycles, however, given that Composia has five moons, not one, this is slightly different.

The five moons, known collectively as the Quinary and in order of appearance, are thus:
1. Corus, Grey, associated with humanoids.
2. Iddus, Green, associated with beastfolk.
3. Omaeth, Red, associated with dragons.
4. Oomanier, Blue, associated with magic.
5. Maeth, White, associated with divinity.

These moons chase each other on slow orbits which allow for three of them to be visible from any given time from the surface, for a peroid of five months each.  Each of these is visible for 100 days at a time, the central sixty of which are known as that moon's Pentinnacle.  The Composian month is twenty days long (and broken into four, five-day weeks,) giving each moon 3 months of Pentinnacle as it chases the prior dominant moon from the skies and is in turn followed by the next.

As the moons so nearly follow the surface of the planet, the order of appearance varies depending upon physical location, with large distances (3000 miles) seperating official Pentinnacle centres.  This gives the Pentinnacle system plus and minus zones.  For example:
Western Coalse (Peakwind, Kaleth) is zone zero; the order is as above numbered.
Eastern Coalse (Peshwan, Hoghkan) is zone +1, incrementing the numbers of all moons up to Maeth, which assumes position 1.
Beastfolk Lands, zone +2.

This system is not perfect, particularly for those directly inbetween the zones.  Some lands, such as Harvelde, have adopted their own dating systems as a result.  There is some disagreement as to which year constitutes year 0 on the Calender, with the standard being just under twenty thousand years ago but with most nations using the starting date of the current governmental system.  

In summary:
5 days per week
4 weeks per month (20 days)
15 months per year (60 weeks or 300 days)

Days, week and months are referred to numerically and referred to as Firstday, Secondweek and Thirdmonth and likewise. 

Dates are generally written as thus:
Day-Week-Month-Pentinnacle-Year
Most read the date from right to left.

Now finally, for thus of you who care and want a practical example, here's the in-game date at time of writing:
5-2-1-5-19,989