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Trical is a calendar based on powers of three.

Trical units of time, provisional names
Unit Definition Equivalence SI equivalence
second 24×60×60/310 = 86400/59049 = ca. 1.463 SI seconds
moment 3 seconds
instant 3 moments 9 s
minute 3 instants  27 s ca. 40 s
dim 3 minutes 81 s ca. 2 min
egg 3 dims  9 min ca. 6 min
take 3 eggs  27 min ca. 18 min
hour 3 takes 81 min 8/9 h
watch 3 hours 243 min 160 min
shift 3 watches 9 h 8 h
day 3 shifts 27 h 86400 s
trip 3 days 81 h
week 3 trips 9 d > 1 week
month 3 weeks 27 d < 1 month
season 3 months 81 d < 1 quarter
triad 3 seasons 243 d
jear 3 triads 729 d ca. 2 years

Leap rule

3^6 = 729 = 2*364.5
(2*729+3) / 4 = 365.25

After every two jears there is a leap trip (3 days), but not always …

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