Orbital Resonance Worldbuilder

v0.5 — Celesta
Visible sky Inner moon Outer moon Conjunction/opp. ☀Sun direction
Day 7 | 7d 1h
day 0 day 63

World parameters

ms
days
days
days
Editing either moon auto-calculates the other to maintain 3:2 ratio
Resonance cycle: 63.32 days = 63.32s

Celestan Calendar

Outer moon orbit ("month") 31.66 days
Months per lunar year 14 months
Lunar year (outer moon ×14) 443.23 days
Solar year 438.25 days
Drift per solar year +4.98 days/year (lunar longer)
Inner moon conjunctions / year 20.76 conjunctions
Near-perfect alignments of lunar & solar calendars
Year Lunar years Off by Quality
89 solar yrs
first near-miss		 = 88 lunar yrs 0.08 days 0.02% off
178 solar yrs = 176 lunar yrs 0.17 days 0.04% off
267 solar yrs = 264 lunar yrs 0.25 days 0.06% off
356 solar yrs = 352 lunar yrs 0.33 days 0.07% off
445 solar yrs = 440 lunar yrs 0.42 days 0.09% off