Time

Since it's a fairly straightforward thing that I've almost finished I figured I'd post the time patterns for this world. Given the importance of light, a solar calendar seems an obvious choice.
Arc: An Arc is the time it takes the sun to travel one tenth of the distance from horizon to horizon. Since this world has seasons, arcs vary in length from one day to the next. The Summer Solstice is an important day, since it has the longest arcs of the year.
Day: A day is the period from sunrise to sunrise. Most people think of it as the period from sunrise to sunset, since the night is a time to be in a secure, and well lit, structure.
Beam: A beam is a ten day period used to estimate travel times. Since almost all travel is done during daylight only, most journeys require more time than their Earthy counterparts would.
Sun: A sun is a period of six beams, roughly half a season.
Year: A year is a six sun period from Summer Solstice to Summer Solstice. Winter Solstice is also a noteworthy event, though it is often regarded as a very unlucky time.
Moondays: Moondays are special events in the year. On these days the moon comes out at night, making the darkness almost safe. Such events are usually marked with a festival or celebration. There are five moondays most years and six moondays during Light Years. Moondays are not a part of the regular calendar. Through a quirk of orbits, the combination of moondays and sundays (normal days) comes out to equal the actual length of the year, with a little bit extra.
Light Year: A light year is a slightly longer year than usual. Over the course of several years a little bit of extra time will slip into the calendar and is made manifest by an extra Moonday in the year. Such years are known as Light Years, since they have more light than usual, and are considered to be lucky.