The Earth's orbit around the Sun from the perspective of Earth takes days. One Sol is defined to be one such solar cycle. The solar cycle determines our seasons and is used to measure age. It is also used to guide activities that must harmonize with the solar or seasonal cycle such as agriculture. Sol is pronounced like soul.
There are no "leap years" in Chronosys. Since each new Sol begins at exactly the number of days and fractions thereof making up the solar cycle, there is never a need for adjustment. This does mean that the moment corresponding to the Gregorian new year will be at a different time of day each solar cycle. For instance, if one Sol begins at midday the next Sol will begin at nightfall, about a quarter of a day later.
Sol zero is defined to begin at daybreak at longitude zero on the day of the winter solstice of the Gregorian year 2012. Since the solar cycle is not dependent on any particular location on Earth, the Sol at a given moment in time is the same at all locations on Earth. As a result, for example, the new Sol occurs simultaneously for everyone in contrast to the new year of the old time system, which occurred over a 24 hour span depending on time zone.
The written indication of the Sol consists of a positive integer number representing the number of cycles since Sol zero began (or a negative until Sol zero begins, when indicating the past), followed by a plus sign (+), followed by the number of days and fraction thereof elapsed in the current Sol. For example, it is currently Sol.
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