Iæran Calendar
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The Iæran Calendar is a solar calendar that is the worldwide standard for determining the position of the Sun relative to the stars on Iær. The calendar year consists of 360 days, however Iær completes an orbit of its Sun in 360.3212 days. This results in the addition of a leap day typically every three years, and rarely in the fourth year.

Each year is divided into fifteen months, each with 24 days, totalling 360 days; the leap day is added to the middle (8th) month during a leap year, making a 25-day month in a 361-day year. The months' names follow a set order in the first seven months of the year; this order is essentially repeated (using a different prefix) in the final 7 months of the year. These traditions originated based on semi-annual harvests.

Month
Name
Meaning
1
Pridole
First sowing
2
Pritise
First sprout
3
Prinera
First blossom
4
Prifloreo
First bloom
5
Prisato
First burgeoning
6
Primesa
First gathering
7
Prilente
First repose
8
Minose
Middle month
9
Thedole
Second sowing
10
Thetise
Second sprout
11
Thenera
Second blossom
12
Thefloreo
Second bloom
13
Thesato
Second burgeoning
14
Themesa
Second gathering
15
Thelente
Second repose

Each month is divided into three eight-day weeks, with the first day of the month falling on the first weekday and the last day of the month falling on the last weekday. When a leap day is inserted, it is placed in the middle of Minose's second week, effectively becoming the middle day of that week, month, and year all at once. This also makes Minose's middle week a nine-day week during a leap year, which ensures that the last day of the month falls on the last weekday as always.

While the standard week follows the same weekday name order, an inserted leap day has its own weekday name (Interdi), which is never otherwise used. The following table describes the weekday names: F
or Weekday below, the first number listed (not in parentheses) indicates the weekday's number during weeks that don't contain a leap day (over 99% of all weeks), while numbers in parentheses indicate that weekday's number during a week in which a leap day is inserted.

Weekday
Name
Meaning
1 (1)
Pridi
First day
2 (2)
Duodi
Second day
3 (3)
Tredi
Third day
4 (4)
Tetradi
Fourth day
– (5)
Interdi
Between day
5 (6)
Pentadi
Fifth day
6 (7)
Hexedi
Sixth day
7 (8)
Septedi
Seventh day
8 (9)
Annadi
Last day

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