# ----------------------- CONSTANTS --------------------------------- #
const EARTHRADIUS = 6.37122e6  # meters
const WATERDENSITY = 1000.

# area
const METERSPERKM = 1000.
const METERSPERMILE = 1609.34
const METERS2PERACRE = 4046.856

# time
const HOURSPERDAY = 24.
const SECSPERHOUR = 3600.
const MINSPERHOUR = 60.
const MINSPERDAY = HOURSPERDAY * MINSPERHOUR
const SECSPERDAY = HOURSPERDAY * SECSPERHOUR
const MONTHSPERYEAR = 12

# length
const MMPERMETER = 1000.
const CMPERMETER = 100.
