Gumi calendar

The Gumi calendar is a lunisolar calendar that was the most commonly used calendar before the introduction of the Standard Astronomical Calendar.

Weeks
Weeks are based on the orbit of Ona. A standard week consists of 10 days: Asgwein falls on the new moon, and Wifgwein falls on the full moon. Since Ona completes one orbit about every 10.31 days, an intercalary day (Ezelgwein) is added every 3 weeks, and an additional intercalary day (Nogwein) is added every 30 weeks.
 * 1) Asgwein
 * 2) Cigwein
 * 3) Hamgwein
 * 4) Moshgwein
 * 5) Dyugwein
 * 6) Wifgwein
 * 7) Talgwein
 * 8) Reimgwein
 * 9) Figwein
 * 10) Seofgwein

Wifgwein, Seofgwein, Asgwein, and the intercalary days are commonly days of rest, while the rest of the week is known as the workweek.

Years
A year consists of 7 months based on the orbit of Una, each with 47 days. The months are: An intercalary month, Bulwice, is added at the end of every other year. Additionally, a second intercalary month, Gyotace, is added after Bulwice every ten years.
 * 1) Nankelbem
 * 2) Deperce
 * 3) Jeonce
 * 4) Abrece
 * 5) Makum
 * 6) Yulice
 * 7) Sugice

In tropical climates, the wet season occurs from Makum to Sugice, with the dry season consisting of the remaining months. In temperate climates, Nankelbem is fall, Deperce and Jeonce are winter, Abrece and Makum are spring, and Yulice and Sugice are summer.