The sky of Laent has three moons: Chariot, Horseman, and Trumpeter (in descending order of size).
The year has 375 days. The months are marked by the rising or setting of the second moon, Horseman. So that (in the year before This Crooked Way begins) Horseman sets on the first day of Bayring, the penultimate month. It rises again on the first of Borderer, the last month. It sets very early in the morning on the first day of Cymbals, the first month of the new year. All three moons set simultaneously on this occasion. (The number of months are uneven-fifteen-so that Horseman rises or sets on the first morning of the year in alternating years.)
The period of Chariot (the largest moon, whose rising and setting marks the seasons) is 187.5 days. (So a season is 93.75 days.)
The period of Horseman is 50 days.
The period of Trumpeter is 15 days. A half-cycle of Trumpeter is a "call." Calls are either "bright" or "dark" depending on whether Trumpeter is aloft or not. (Usage: "He doesn't expect to be back until next bright call.")
The seasons are not irregular, as on Earth. But the moons' motion is not uniform through the sky: motion is faster near the horizons, slowest at the zenith. Astronomical objects are brighter in the west, dimmer in the east.
The three moons and the sun rise in the west and set in the east. The stars have a different motion entirely, rotating NWSE around a celestial pole. The pole points at a different constellation among a group of seven (the polar constellations) each year. (Hence, a different group of nonpolar constellations is visible near the horizons each year.) This seven-year cycle (the Ring) is the basis for dating, with individual years within it named for their particular polar constellations.
The Polar constellations are: the Reaper, the Ship, the Hunter, the Door, the Kneeling Man, the River, the Wolf.
There is an intrapolar constellation, the Hands, within the space inscribed by the motion of the pole.
This calendar was first developed in the Wardlands, and then spread to the unguarded lands by exiles. In the Wardlands, years are dated from the founding of New Moorhope, the center of learning. The action of This Crooked Way begins in the 464th Ring, Moorhope year 3245, the Year of the River. But in the Ontilian Empire, the years are dated from the death of Uthar the Great, a system that came into widespread use north and south of the Kirach Kund.
The novel begins early in the month of Brenting, 333 A.U.
48th Ring, A.U. 333: Year of the River
1. Cymbals.
New Year. Winter begins.
1st: Chariot, Horseman, and Trumpeter all set.
8th & 23rd: Trumpeter rises.
2. jaric.
1st: Horseman rises. 13th: Trumpeter rises.
3. Breij ip~.
1st: Horseman sets. 3rd and 18th: Trumpeter rises.
4. Drums.
1st: Horseman rises. 8th and 23rd: Trumpeter rises. Midnight of 94th day of the year (19 Drums): Chariot rises. Spring begins.
5. Rain.
1st: Horseman sets. 13th: Trumpeter rises.
6. Marryitjg.
1st: Horseman rises. 3rd and 18th: Trumpeter rises.
7. Ambrose.
1st: Horseman sets. 8th and 23rd: Trumpeter rises.
8. Harps.
1st: Horseman rises. 13th: Trumpeter rises. Evening of the 188th day of year (19 Harps): Chariot sets; Midyear-Summer begins.
9. Tort
1st: Horseman sets. 3rd and 18th: Trumpeter rises.
10. Rememberiv .
1st: Horseman rises. 8th and 23rd: Trumpeter rises.
11. Vicjory.
1st: Horseman sets. 13th: Trumpeter rises.
12. Harvesli1g.
1st: Horseman rises. 3rd and 18th: Trumpeter rises.
6th: Chariot rises, noon of 281st day of year. Fall begins.
13. Mojljer and Maider).
1st: Horseman sets. 8th and 23rd: Trumpeter rises.
14. Bayrin..
1st: Horseman rises. 13th: Trumpeter rises.
15. Borderer.
1st: Horseman sets. 3rd and 18th: Trumpeter rises.