Since Mone's orbit was stabilized during the foundation of the Ottansey colony, the yere dovetails nicely with revolutions of Mone. The yere is divided into ten twams of 29.850 days each; each twam is two mones of slightly less than fifteen days each.

The inevitable simplification gives eight twams of 30 days and two of 29; every second yere is a leap yere with nine 30-day twams.

The yere begins with new mone immediately before the vernal equinox. Then each twam progresses through the same cycle of monation, with new mones at midnight of the 1st/15th days, first quarter at 3.75/18.75 days, full at 7.5/22.5 days, and last quarter at 11.25/25.25 days.

Rather than weeks, each twam is divided into four periods of waxing and waning mone: Greater Waxing of 8 days, Lesser Waning of 7, Lesser Waxing of 7, and Greater Waning of 8. When a twam has only 29 days, the cycle is slightly changed: Greater Waxing (8), First Waning (7), Lesser Waxing (7), and Second Waning (7).

The "days of the week" cycle thus repeats in this fashion:

Greater Waxing

1 - Darkday

2 - Starday

3 - Windsday

4 - Midwax

5 - Grunday

6 - Kinday

7 - Sunday

8 - Fulday

Lesser Waning

9 - Shinday

10- Windsday

11 - Midwane

12 - Grunday

13 - Halday

14 - Tweenday

15 - Dimday

Lesser Waxing

16 - Darkday

17 - Starday

18 - Windsday

19 - Midwax

20 - Grunday

21 - Sunday

22 - Fulday

Greater Waning

23 - Shinday

24 - Wyrmday (dropped in Whitmon & Dixia)

25 - Windsday

26 - Midwane

27 - Grunday

28 - Halday

29 - Kinday

30 - Dimday

Specific dates are usually referred to by day-names: Wyrmday and Tweenday occur only once in each twam; Windsday and Grunday occur four times and are distinguished by "first," "second," "third," or "fourth." Other days, occuring twice each, are designated as "first" or "second" on Dakan and Tumaden, and as "greater" and "lesser" in Ladamar.

The Mids -- Midwax and Midwane -- are days of rest, equivalent to Terra's Sunday.

The twams are named as follows:

Spring

1 - Niwyar (30 days)

2 - Grenmon (30 days)

Summer

3 - Dixia (29 days/30 leap yere)

4 - Kaalon (30 days)

5 - Melemon (30 days)

Autumn

6 - Hwatmon (30 days)

7 - Erst (30 days)

Winter

8 - Brandym (30 days)

9 - Whitmon (29 days)

10 - Yarnd (30 days)

Vernal equinox: First Darkday, Niwyar

Summer Solstice: Tweenday, Dixia

Autumnal Equinox: First Darkday, Hwatmon

Winter Solstice: Tweenday, Brandym

Ottansey yeres are counted from the date of colonization (TE 817/2970 CE), which is designated O.Y. 817. Since the Ottanseyn yere is 1.09 Terran years, 4124 CE = O.Y. 1875.

To convert:

Ottanseyn Yere = ((Year CE - 2970)/1.09)+817

Year CE = ((OY-817)*1.09)+2970

copyright © 2003, Don Sakers

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