The Herbras System of Units is a system of units based upon the real-world International System of Units (SI).


The Herbras System of Units was created by John Herbert, a settler on the planet of Ithos. The units of mass and length were derived from the typical weight and length of a rock on Ithos. The standard of temperature was derived from the temperature at the south pole on Ithos. The standard of time was based upon the lunar and solar cycles of Ithos.


HSU base units
Quantity Symbol Unit Name SI USCU
length i the ithos 1 m 3.28084 ft.
mass h the herbert 1 kg 2.20462 lbs.
time hct herbras calculated time 1 s N/A
temperature H the hydros 1 K -457.87 F


Prefixes for the Herbras System of Units
Multiples name deca- hecto- kilo- mega- giga-
Symbol da h k M G
Factor 100 101 102 103 106 109
Fractions Name deci- centi- milli- micro- nano-
Symbol d c m μ n
Factor 100 10-1 10-2 10-3 10-6 10-9

Calendar and Time

The Calendar is derived from the Ithosian lunar and solar cycles. Years are split into 10 months of 28 days, split into 4 weeks of 7 days. This totals 280 days per year. Days are split into 24 hours, 60 minutes per hour, and 60 seconds per minute. Years are measured in Herbert Calculated Year (HCY).

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