Salah

Usage

Add the following to your Cargo.toml file under the [dependencies] section:

[dependencies]
salah = "0.7.5"

To get prayer times, use the PrayerSchedule struct passing in coordinates, date, and calculation parameters.

use salah::prelude::*;

let new_york_city = Coordinates::new(40.7128, -74.0059);
let date          = NaiveDate::from_ymd_opt(2019, 1, 25).expect("Invalid date provided");
let params        = Configuration::with(Method::MoonsightingCommittee, Madhab::Hanafi);
let prayers       = PrayerSchedule::new()
                      .on(date)
                      .for_location(new_york_city)
                      .with_configuration(params)
                      .calculate();

Initialization parameters

Coordinates

Create a Coordinates struct with the latitude and longitude for the location you want prayer times for.

let coordinates = Coordinates::new(40.7128, -74.0059);

Date

To avoid confusion with timezones the date parameter passed in should be an instance of NaiveDate. The year, month, and day components need to be populated. All other components will be ignored.

let date = NaiveDate::from_ymd_opt(2019, 1, 25);

Configuration

The calculation of the prayer times requires certain pieces of information. These can configured using the Configuration struct, a builder for the underlaying Parameters struct. This struct can be initialized by passing one of the Method enum variants (see below for the available variants) along with the one of the Madhab enum variants. You can then further customize the calculation parameters if needed.

let params = Configuration::with(Method::NorthAmerica, Madhab::Hanafi);

Parameter	Description
method	Which preset from the CalculationMethod enum was used. Default value is other.
fajr_angle	Angle of the sun below the horizon used to calculate Fajr.
maghrib_angle	Angle of the sun below the horizon used to calculate Maghrib, used for some Calculation Methods.
isha_angle	Angle of the sun below the horizon used to calculate Isha.
isha_interval	Minutes after Maghrib (if set, the time for Isha will be Maghrib plus isha_interval).
madhab	Which setting from the Madhab enum to use for calculating Asr.
high_latitude_rule	Which setting from the HighLatitudeRule enum to use for calculating the minimum time for Fajr and the maximum time for Isha.
adjustments	PrayerAdjustments struct with custom prayer time adjustments in minutes for each prayer time.
rounding	The behavior for rounding prayer times. Either to nearest minute, to the higher minute, or none.
shafaq	Used by the MoonsightingCommittee method to determine how to calculate Isha. See explanation of values below.

Method

Provides preset configuration for a few authorities for calculating prayer times.

Value	Description
MuslimWorldLeague	Muslim World League. Standard Fajr time with an angle of 18°. Earlier Isha time with an angle of 17°.
Egyptian	Egyptian General Authority of Survey. Early Fajr time using an angle 19.5° and a slightly earlier Isha time using an angle of 17.5°.
Karachi	University of Islamic Sciences, Karachi. A generally applicable method that uses standard Fajr and Isha angles of 18°.
UmmAlQura	Umm al-Qura University, Makkah. Uses a fixed interval of 90 minutes from maghrib to calculate Isha. And a slightly earlier Fajr time with an angle of 18.5°. Note: you should add a +30 minute custom adjustment for Isha during Ramadan.
Dubai	Used in the UAE. Slightly earlier Fajr time and slightly later Isha time with angles of 18.2° for Fajr and Isha in addition to 3 minute offsets for sunrise, Dhuhr, Asr, and Maghrib.
Qatar	Same Isha interval as ummAlQura but with the standard Fajr time using an angle of 18°.
Kuwait	Standard Fajr time with an angle of 18°. Slightly earlier Isha time with an angle of 17.5°.
MoonsightingCommittee	Method developed by Khalid Shaukat, founder of Moonsighting Committee Worldwide. Uses standard 18° angles for Fajr and Isha in addition to seasonal adjustment values. This method automatically applies the 1/7 approximation rule for locations above 55° latitude. Recommended for North America and the UK.
Singapore	Used in Singapore, Malaysia, and Indonesia. Early Fajr time with an angle of 20° and standard Isha time with an angle of 18°.
Turkey	An approximation of the Diyanet method used in Turkey. This approximation is less accurate outside the region of Turkey.
Tehran	Institute of Geophysics, University of Tehran. Early Isha time with an angle of 14°. Slightly later Fajr time with an angle of 17.7°. Calculates Maghrib based on the sun reaching an angle of 4.5° below the horizon.
NorthAmerica	Also known as the ISNA method. Can be used for North America, but the moonsightingCommittee method is preferable. Gives later Fajr times and early Isha times with angles of 15°.
Other	Defaults to angles of 0°, should generally be used for making a custom method and setting your own values.

Madhab

Setting for the Asr prayer time. For Hanafi madhab, the Asr is bit later than that of the Shafi madhab.

Value	Description
Shafi	Earlier Asr time (use for Shafi, Maliki, Hanbali, and Jafari)
Hanafi	Later Asr time

HighLatitudeRule

Rule for approximating Fajr and Isha at high latitudes.

Value	Description
MiddleOfTheNight	Fajr won't be earlier than the midpoint of the night and isha won't be later than the midpoint of the night. This is the default value to prevent fajr and isha crossing boundaries.
SeventhOfTheNight	Fajr will never be earlier than the beginning of the last seventh of the night and Isha will never be later than the end of the first seventh of the night. This is recommended to use for locations above 48° latitude to prevent prayer times that would be difficult to perform.
TwilightAngle	The night is divided into portions of roughly 1/3. The exact value is derived by dividing the fajr/isha angles by 60. This can be used to prevent difficult fajr and isha times at certain locations.

You can get the recommended High Latitude Rule for a location by calling the recommended(coordinates:) function and passing in the coordinates for the location.

let myCoordinates = Coordinates { latitude: 48.983226, longitude: -3.216649 };
let highLatRule = HighLatitudeRule::recommended(myCoordinates);

Shafaq

Shafaq is used by the MoonsightingCommittee method to determine what type of twilight to use in order to determine the time for Isha.

Value	Description
General	General is a combination of Ahmer and Abyad. This is the defualt value and will provide more reasonable times for locations at higher latitudes.
Ahmer	Ahmer means the twilight is the red glow in the sky. Used by the Shafi, Maliki, and Hanbali madhabs. This generally produces an earlier Isha time.
Abyad	Abyad means the twilight is the white glow in the sky. Used by the Hanafi madhab. This generally produces a later Isha time.

Prayer Schedule

The PrayerSchedule struct is a builder for the the PrayerTimes struct. Once the calculate() method is invoked on it, a PrayerTime struct will be initialized and it will contain fields for all five prayer times, the time for sunrise, and for the Qiyam prayer.

The prayer time will be an instance of DateTime<Utc> and as such will refer to a fixed point in universal time. To display these times for the local timezone you will need to format them with the appropriate local time zone.

This struct provides convenience methods for the prayer times to ease their usage and display.

PrayerTime

Method	Description
name()	Returns the name of the payer transliterated in English.
time(prayer: Prayer)	Returns the time of the prayer as a DateTime<Utc>. See the DateTime documentation for manipulating the return value.
current()	Returns the current prayer as the Prayer type.
next()	Returns the next prayer as the Prayer type.
time_remaining()	Returns a tuple with the hours as its first element, and minutes as its second element. The value is always in the context of the current prayer.

Prayer

This is an enum and has variants for all prayers, including, sunrise and Qiyam. This is single method available for this type called, name(), that will return the name of the prayer transliterated into English.

Full Example

use salah::prelude::*;

let new_york_city = Coordinates::new(40.7128, -74.0059);
let date          = NaiveDate::from_ymd_opt(2019, 1, 25).expect("Invalid date provided.");
let params        = Configuration::with(Method::NorthAmerica, Madhab::Hanafi);
let prayers       = PrayerSchedule::new()
                        .on(date)
                        .for_location(new_york_city)
                        .with_configuration(params)
                        .calculate();

match prayers
{
    Ok(prayer) => {
        println!("{}: {}", Prayer::Fajr.name(), prayer.time(Prayer::Fajr).format("%-l:%M %p").to_string());
        println!("{}: {}", Prayer::Sunrise.name(), prayer.time(Prayer::Sunrise).format("%-l:%M %p").to_string());
        println!("{}: {}", Prayer::Dhuhr.name(), prayer.time(Prayer::Dhuhr).format("%-l:%M %p").to_string());
        println!("{}: {}", Prayer::Asr.name(), prayer.time(Prayer::Asr).format("%-l:%M %p").to_string());
        println!("{}: {}", Prayer::Maghrib.name(), prayer.time(Prayer::Maghrib).format("%-l:%M %p").to_string());
        println!("{}: {}", Prayer::Isha.name(), prayer.time(Prayer::Isha).format("%-l:%M %p").to_string());
        println!("{}: {}", Prayer::Qiyam.name(), prayer.time(Prayer::Qiyam).format("%-l:%M %p").to_string());
    },
    Err(error) => println!("Could not calculate prayer times: {}", error)
}

The output will be (in UTC):

Fajr: 10:53 AM
Sunrise: 12:12 PM
Dhuhr: 5:09 PM
Asr: 8:24 PM
Maghrib: 10:05 PM
Isha: 11:24 PM
Qiyam: 6:37 AM

Convenience Utilities

The PrayerTimes struct has functions for getting the current prayer and the next prayer. You can also get the time for a specified prayer, making it easier to dynamically show countdowns until the next prayer.

...
let prayers = PrayerSchedule::new()
                .on(date)
                .for_location(new_york_city)
                .with_configuration(params)
                .calculate();
let (hours, minutes) = prayers.current().time_remaining();

println!("Current: {} ({}:{})", prayers.current().name, hours, minutes);
println!("Next prayer is {} at {}.", prayers.next().name, prayers.time(prayer.next()).format("%-l:%M %p").to_string()));

Qibla Direction

Get the direction, in degrees from North, of the Qibla from a given set of coordinates.

let new_york_city   = Coordinates::new(40.7128, -74.0059);
let qiblah_direction = Qiblah::new(new_york_city);

println!("Qiblah: {}", qibla_direction); //  Outputs: Qiblah: 58.4817

TO access that actual numerical (f64) value of the qiblah direction, you can use the value() method on the Qiblah instance.

let new_york_city   = Coordinates::new(40.7128, -74.0059);
let qiblah_direction = Qiblah::new(new_york_city);

println!("Qiblah: {}", qibla_direction.value()); //  Outputs: Qiblah: 58.48176358718943

Contributing

Please see the CONTRIBUTING.md file for more information.

Code of Conduct

Our contributor code of conduct can be found in the code-of-conduct.md file.

Acknowledgement

This library is based on the Adhan library by Batoul Apps. All astronomical calculations are high precision equations directly from the book Astronomical Algorithms by Jean Meeus.

License

Salah is licensed under a three clause BSD License. It basically means: do whatever you want with it as long as the copyright in Salah sticks around, the conditions are not modified and the disclaimer is present. Furthermore you must not use the names of the authors to promote derivatives of the software without written consent.

The full license text can be found in the LICENSE file.