Rikchik units of measurement

Distance

	name	original meaning	relation	human equivalent
	Blade	length of grass blade		9.5 in	24 cm
	Reach	length of tentacle	7 (10) Blades	5.5 ft	1.6 m
	Throw	range of thrown rock	21 (30) Reaches	39 yd	35 m
	Walk	a day's walk	1372 (4000) Throws	30 miles	48 km

Area

	name	human equivalent
	Circled Blade	43 in2	278 cm2
	Circled Reach	24 ft2	2.2 m2
	Circled Throw	1164 yd2	971 m2
	Circled Walk	708 miles2	1832 km2

Weight

	name	original meaning	relation	human equivalent
	Fruit	the weight of the average rock-fruit		19 oz	0.5 kg
	Work	a comfortable load for a strong rikchik	98 (200) Fruits	116 lb	53 kg

name	name	relation	human equivalent	note
	second (rock-span)		2.4 Earth seconds	These three are derived from the length of the day. Seconds were historically measured by a pebble-clock (a fast, calibrated hourglass), minutes by a water-clock, and hours with a candle.
	minute (water-span)	49 (100) Seconds	118 Earth seconds
	hour (fire-span)	49 (100) Minutes	96 Earth minutes
	day (sun-span)	14 (20) Hours	22.46 Earth hours	One rotation of the planet (that is, one planetary day). Days start at sunrise and consist of seven "Bright" hours and seven "Dark" hours.
	week (7-span)	7 (10) days	6.5 Earth days	The days of the week are Sun-day, Sky-day, Tree-day, Grass-day, Water-day, Rock-day, and Fire-day.
	weekday (tentacle-span)
	block (number-span)	23 (32) days	21.5 Earth days	There are 3 seasons of 7 blocks each.
	year (tree-span)	21 (30) blocks, or 483 (1260) days	1.24 Earth years	The year begins at the spring solstice. A weekless, blockless leap day is added every 19 years.
	cycle (circle-span)	64 or 65 years (121 or 122)	80 Earth years	One orbit of Alpha Centauri B. 3 of 7 cycles are 64 years long.
	great cycle (big-circle-span)	7 (10) cycles, or 472 (1243) years	560 Earth years	The first great cycle began in 715 BCE.