An F# library that given a latitude and logitude record will return the direction of the Kaaba, also known as the Qibla. The algorithm is based on The Correct Qibla by S. Kamal Abdali.

Install

dotnet add package QiblaDirection

or from Visual Studios package manager console

Install-Package QiblaDirection -ProjectName YOUR_PROJECT_NAME

Example

open QiblaDirection

(*
  Case: Ok,
  trueNorth: Degrees 118.93071604419522
*)
GetQiblaDirectionHandler.qiblaDirectionQueryHandler' { lat = 51.522079; lon = -0.191380 }

open QiblaDirection

(* Output:
  Case: Error
    [
      {
        message: "Please provide a latitude value between -90 to 90"
        invalidField: "latitude"
      },
      {
        message: "Please provide a longitude value between -180 to 180"
        invalidField: "longitude"
      }
    ]
*)
GetQiblaDirectionHandler.qiblaDirectionQueryHandler'{ lat = 90.0012; lon = 180.0121 }