THE TERRAN SERIES

The Terran Series · Time Architecture

Earth · Mars — Time Conversion

Every unit of time in the Terran Series, translated between Earth and Mars. Enter any value to convert. The reference table below holds the complete equivalence set.

Interactive converter — enter any value

⊕ Earth
♂ Mars
Clock drift — for the duration entered:
Enter a value above to see cumulative sol drift.

Reference table — complete equivalence set

Unit Earth ⊕ Mars ♂ Note
Time units
1 minute 60 seconds 60 seconds Identical — SI unit
1 hour 60 minutes 60 minutes Identical — SI unit
1 day / 1 sol 24h 00m exactly 24h 37m 22s per sol +37.4 min per sol
1 Earth day in sols 1.000 day 0.97327 sols Earth day is shorter
1 sol in Earth days 1.02749 days 1.000 sol Sol is longer
Weeks
1 week (7 days/sols) 7 days = 168h 7 sols = 172h 19m +4h 19m per week
1 Earth week in sols 7.000 days 6.8129 sols —
Months
1 Terran month 28 days exactly 27.252 sols 4 weeks × 7 days
1 Martian month ~50.35 Earth days ~49 sols (47.76 mean) 7 months × 49 + 7 × 49
Lunar month (ref) 29.53 days 28.74 sols Earth Moon only
Menstrual cycle (ref) ~29.5 days (mean) ~28.7 sols Earth-calibrated biology
Years
1 Earth year 365.25 days 355.42 sols · 0.5316 Mars years 13 Terran months + Foundation Day
1 Martian year 686.97 days · 1.8809 Earth years 668.6 sols · 14 Martian months + Foundation Sol
Ratio Mars/Earth year — 1.8809× Mars year nearly 2× Earth
Longer durations
5 Earth years 1,826 days 2.66 Mars years · 1,777 sols —
10 Earth years 3,653 days 5.32 Mars years · 3,554 sols —
20 Earth years 7,305 days 10.63 Mars years · 7,108 sols Drift: 184 Earth days
5 Mars years 9.40 Earth years · 3,435 days 3,343 sols —
10 Mars years 18.81 Earth years · 6,870 days 6,686 sols —
20 Mars years 37.62 Earth years · 13,739 days 13,372 sols Drift: 368 Earth days
Clock drift accumulation
Per sol 37.4 minutes behind Mars — Earth clock runs short
Per Martian month (~49 sols) ~30.5 hours drift — ~1.3 Earth days
Per Martian year (668.6 sols) ~416 hours drift — ~17.3 Earth days
To drift 1 full Earth day 38.5 sols elapsed — ~39 sols per day drift
20 Earth years on Mars 184 Earth days of drift — Earth clock 6 months behind
20 Mars years on Mars 368 Earth days of drift — Earth clock ~1 year behind
Biological reference points
Circadian period 24.0h — co-evolved 24h 37m sol — outer edge of entrainment Entrainment plausible
Ultradian BRAC ~90 min ~90 min (unchanged) Not sol-dependent
Infradian cycle ~29.5 days (mean) ~28.7 sols equivalent Earth-calibrated; Mars resonance unknown
Terran month / infradian 28 days — 1.5 day shorter than mean cycle ~27.3 sols equivalent 28-day question open
Martian month / infradian ~50.4 days — far longer than cycle ~49 sols No known resonance

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