Salah
Usage
Add the following to your Cargo.toml
file under the [dependencies]
section:
[dependencies]
salah = "0.4.2"
To get prayer times, use the PrayerSchedule
struct passing in coordinates, date, and calculation parameters.
use *;
let new_york_city = new;
let date = Utc.ymd;
let params = with;
let prayers = new
.on
.for_location
.with_configuration
.calculate;
Initialization parameters
Coordinates
Create a Coordinates
struct with the latitude and longitude for the location
you want prayer times for.
let coordinates = new;
Date
To avoid confusion with timezones the date parameter passed in should be an instance of
Date<Utc>
. The year, month, and day components need to be populated. All other
components will be ignored.
let date = Utc.ymd;
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 = with;
Parameter | Description |
---|---|
method |
Member of Method enum |
fajr_angle |
Angle of the sun used to calculate Fajr |
isha_angle |
Angle of the sun used to calculate Isha |
isha_interval |
Minutes after Maghrib (if set, the time for Isha will be Maghrib plus isha_interval ) |
madhab |
Member of the Madhab enum, used to calculate Asr |
high_latitude_rule |
Member of the HighLatitudeRule enum, used to set a minimum time for Fajr and a max time for Isha |
time_adjustments |
TimeAdjustment struct with adjustment based on the selected Method . |
custom_time_adjustments |
TimeAdjustment struct with custom prayer time adjustments in minutes for each prayer time. By default, all values are 0 . |
Method
Value | Description |
---|---|
MuslimWorldLeague |
Muslim World League. Fajr angle: 18, Isha angle: 17 |
Egyptian |
Egyptian General Authority of Survey. Fajr angle: 19.5, Isha angle: 17.5 |
Karachi |
University of Islamic Sciences, Karachi. Fajr angle: 18, Isha angle: 18 |
UmmAlQura |
Umm al-Qura University, Makkah. Fajr angle: 18.5, Isha interval: 90. Note: you should add a +30 minute custom adjustment for Isha during Ramadan. |
Dubai |
Method used in UAE. Fajr angle: 18.2, Isha angle: 18.2. |
Qatar |
Modified version of Umm al-Qura used in Qatar. Fajr angle: 18, Isha interval: 90. |
Kuwait |
Method used by the country of Kuwait. Fajr angle: 18, Isha angle: 17.5 |
MoonsightingCommittee |
Moonsighting Committee. Fajr angle: 18, Isha angle: 18. Also uses seasonal adjustment values. |
Singapore |
Method used by Singapore. Fajr angle: 20, Isha angle: 18. |
NorthAmerica |
Referred to as the ISNA method. Fajr angle: 15, Isha angle: 15 |
Other |
Fajr angle: 0, Isha angle: 0. This is the default value for when manually initializing the Parameters struct. |
Madhab
Value | Description |
---|---|
Shafi |
Earlier Asr time |
Hanafi |
Later Asr time |
HighLatitudeRule
Value | Description |
---|---|
MiddleOfTheNight |
Fajr will never be earlier than the middle of the night and Isha will never be later than the middle of the night |
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 |
TwilightAngle |
Similar to SeventhOfTheNight, but instead of 1/7, the fraction of the night used is fajr_angle/60 and isha_angle/60 |
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 *;
let new_york_city = new;
let date = Utc.ymd;
let params = with;
let prayers = new
.on
.for_location
.with_configuration
.calculate;
match prayers
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 = new
.on
.for_location
.with_configuration
.calculate;
let = prayers.current.time_remaining;
println!;
println! );
Qibla Direction
Get the direction, in degrees from North, of the Qibla from a given set of coordinates.
let new_york_city = new;
let qibla_direction = new;
println!; // Outputs: Qiblah: 58.4817
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.