Calculation Methods

Calculation Methods

Al-Falak supports 11 calculation methods. Each method defines Fajr and Isha angles (or intervals) and may include additional adjustments.

Method comparison

Method	Fajr Angle	Isha Angle	Isha Interval	Notes
Muslim World League	18°	17°	—	Standard MWL method
ISNA (North America)	15°	15°	—	Not recommended for general use
Egyptian	19.5°	17.5°	—	Egyptian General Authority
Karachi	18°	18°	—	University of Islamic Sciences
Umm al-Qura	18.5°	—	90 min	Add +30 min in Ramadan
Dubai	18.2°	18.2°	—	Gulf region
Moonsighting Committee	18°	18°	—	Seasonal adjustments
Kuwait	18°	17.5°	—	Kuwait method
Qatar	18°	—	90 min	Modified Umm al-Qura
Singapore	20°	18°	—	Singapore method
UOIF	12°	12°	—	Union des organisations islamiques de France

Using a method

from alfalak import PrayerTimes, CalculationMethod

prayer_times = PrayerTimes(
    coordinates,
    datetime.now(),
    CalculationMethod.MUSLIM_WORLD_LEAGUE,
)

Custom parameters

Override any method’s defaults with CalculationParameters:

from alfalak import CalculationParameters

params = CalculationParameters(
    fajr_angle=18,
    isha_angle=17,
    isha_interval=0,
)

Method precedence

When you pass both a CalculationMethod and custom parameters to CalculationParameters, the method’s built-in values take precedence:

# fajr_angle=12 is ignored because MOON_SIGHTING_COMMITTEE sets it to 18
params = CalculationParameters(
    fajr_angle=12,
    method=CalculationMethod.MOON_SIGHTING_COMMITTEE,
)
print(params.fajr_angle)  # 18.0

See also

• Madhab — Shafi vs Hanafi Asr calculation
• High Latitude Rules — handling extreme latitudes
• Polar Regions — handling polar day/night