@yachteye/signalk-makkah-plugin/plugin/SunAndPrayTime.js

Add Salah and Sun times to the SignalK graph

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.SunAndPrayTimeCalculator = void 0;
const PrayTime_1 = require("./PrayTime");
class SunAndPrayTimeCalculator extends PrayTime_1.PrayTime {
    constructor() {
        super();
        /** Angle to use for Sunset and Sunrise calculation. */
        this.sunDegrees = 0.8333;
        /** Angle to use for Civic Twilight calculations. */
        this.civicTwilightDegrees = 6.0;
        this.numIterations = 2;
    }
    /**
     * Return sun times for a given date.
     * @param year Four digit year
     * @param month The month component, expressed as a value between 1 and 12.
     * @param day The day component (value between 1 and 31).
     * @param latitude In decimal degrees.
     * @param longitude In decimal degrees.
     * @param timeZoneHours Time zone (hours).
     * @returns An object with sun times in hours. In case a time can not be calculated the properties are NULL.
     */
    GetSunTimes(year, month, day, latitude, longitude, timeZoneHours) {
        // console.log('GetSunTimes()', 'y', year, 'm', month, 'day', day, 'tz', timeZoneHours);
        this.lat = latitude;
        this.lng = longitude;
        this.timeZone = timeZoneHours;
        this.JDate = this.JulianDate(year, month, day) - longitude / (15.0 * 24.0);
        const sunrise = this.computeSunTime(180 - this.sunDegrees, 6);
        const sunset = this.computeSunTime(this.sunDegrees, 18);
        const twilightStart = this.computeSunTime(180 - this.civicTwilightDegrees, 6);
        const twilightEnd = this.computeSunTime(this.civicTwilightDegrees, 18);
        return { sunrise: sunrise, sunset: sunset, civicTwilightStart: twilightStart, civicTwilightEnd: twilightEnd };
    }
    computeSunTime(angle, startHour) {
        let timeHours = startHour;
        for (let iteration = 0; iteration < this.numIterations; iteration++) {
            timeHours = this.computeTime(angle, timeHours / 24.0);
        }
        if (isNaN(timeHours)) {
            return null;
        }
        else {
            timeHours = timeHours + this.timeZone - this.lng / 15.0;
            if (timeHours < 0) {
                timeHours += 24.0;
            }
            if (timeHours >= 24.0) {
                // Looks like this can happen if the time zone is not correct.
                timeHours -= 24.0;
            }
            return timeHours;
        }
    }
}
exports.SunAndPrayTimeCalculator = SunAndPrayTimeCalculator;