Check if a house system is available at a given latitude
Some house systems (Placidus, Koch) fail at extreme latitudes (above ~66°, the Arctic/Antarctic circles) where some ecliptic degrees never rise or set during certain times of year.
House system to check
Geographic latitude in degrees
true if the system can be used at this latitude
isHouseSystemAvailable('placidus', 51.5) // true (London)isHouseSystemAvailable('placidus', 70) // false (Arctic)isHouseSystemAvailable('equal', 70) // true (works everywhere)isHouseSystemAvailable('placidus', 90) // false (North Pole) Copy
isHouseSystemAvailable('placidus', 51.5) // true (London)isHouseSystemAvailable('placidus', 70) // false (Arctic)isHouseSystemAvailable('equal', 70) // true (works everywhere)isHouseSystemAvailable('placidus', 90) // false (North Pole)
Check if a house system is available at a given latitude
Some house systems (Placidus, Koch) fail at extreme latitudes (above ~66°, the Arctic/Antarctic circles) where some ecliptic degrees never rise or set during certain times of year.