The measurements on Arth center around The Emperor and the Imperium. The Imperium imposes certain standards upon its subjects to make communication and trade between areas easier. Some of the most important was how much each coin was worth (and its basic size), the common language (imperial-low and high), and a system of measures.
Since the Emperor is immortal, his body is used as the standard for measurements. In each Regions city center, there is a hall of standards, where you can receive a true measurement of something.
(1 Meter or a fraction less, a Yard and a bit more).
is the most common width for a public hallway, being two strides wide.
(less than 1/3 of a Meter or more than a foot). Since the two do not conviently line up, most people measure larger things in Strides.
(50 Miles or 80 KM). The distance the Emperor can conviently walk in a day. It is also the distance the Imperial Army expects its forces to cover in a day.
, called A weight, is approximately one pound. Some areas call it a stone, as each weight stone weighs one pound.
Elventi have an innate sense for time linked to their longevity, so they never developed a system fo measuring time. They adopted a Humanti system and made it the standard.
Each 24 hour day is divided into two cycles of the six elements, one for day, one for night. Dawn (6 am) starts the first cycle. It usually ends at approximately sunset (6pm). Noon occurs at the begining of the 4th cycle. Most people call each part of the cycle either a candlemark, or one hour (which is two Modern/ European hours).
So by local reckoning, Noon is not 12’oclock, but 4th Hour or Fire Hour.
Each Hour is broken down into six Sets (2o minutes each).
The next smallest unit is a mark (approximaley 12 seconds), with 100 marks to a Set. This unit was created by magic users, based upon the flow of magic and the duration of magical knots. A fivemark is a commonly used unit of measure.
In Antioch, the archaic unit of beat is also used. There are 12 beats to a mark. It is said that each imperial heartbeat is one beat long. But in actuallity, it is an Elventi magical tool, as one beat is one increment of action. The fighting arts still use this measure to be fancy. It is coming back into vogue is because certain impressor tools need consistant percision and the beat is a good measure for timing.
So to sum up
1 Day is 12 Hours (two sets of six) or 72 sets or 7200 Marks (1440 FiveMarks), or 86400 beats.
Light, Earth, Air, Fire, Water, Darkness, is the elemental day cycle
Darkness, Water, Earth, Air, Fire, Light, is the elemental night cycle.
The measurement of days, weeks, and months were also adopted from Humanti ideas and have become the standards. So there are 216 days in the Imperial (and real) year. There are six months, with six, six day weeks each month.
One Moon cycle on Arth is normally 36 days, but that can change from biome to biome.