331 lines
No EOL
7.7 KiB
JavaScript
331 lines
No EOL
7.7 KiB
JavaScript
__setupPackage__( __extension__ );
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com.telldus.suncalculator = function() {
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//sunrise/sunset calculator, derived from the work of Stephen R. Schmitt
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var PI = Math.PI;
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var DR = PI/180;
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var K1 = 15*DR*1.0027379
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var Sunrise = false;
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var Sunset = false;
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var Rise_time = [0, 0];
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var Set_time = [0, 0];
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var Rise_az = 0.0;
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var Set_az = 0.0;
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var Sky = [0.0, 0.0];
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var RAn = [0.0, 0.0, 0.0];
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var Dec = [0.0, 0.0, 0.0];
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var VHz = [0.0, 0.0, 0.0];
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// calculate sunrise and sunset times
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function riseset(date)
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{
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var settings = new com.telldus.settings();
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var lat = 56.1488; //55.6893; //default
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var lon = 13.3538; //13.2123; //default
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lat = settings.value("latitude", lat);
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lon = settings.value("longitude", lon);
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lat = 55 + 68.93/60.0;
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lon = 13 + 21.23/60.0;
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var k;
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var zone = Math.round(date.getTimezoneOffset()/60);
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var jd = julian_day(date) - 2451545; // Julian day relative to Jan 1.5, 2000
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if ((sgn(zone) == sgn(lon))&&(zone != 0))
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print("WARNING: time zone and longitude are incompatible!");
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lon = lon/360;
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var tz = zone/24;
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var ct = jd/36525 + 1; // centuries since 1900.0
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var t0 = lst(lon, jd, tz); // local sidereal time
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jd = jd + tz; // get sun position at start of day
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sun(jd, ct);
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var ra0 = Sky[0];
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var dec0 = Sky[1];
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jd = jd + 1; // get sun position at end of day
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sun(jd, ct);
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var ra1 = Sky[0];
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var dec1 = Sky[1];
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if (ra1 < ra0) // make continuous
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ra1 = ra1 + 2*PI;
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Sunrise = false; // initialize
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Sunset = false;
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RAn[0] = ra0;
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Dec[0] = dec0;
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for (k = 0; k < 24; k++) // check each hour of this day
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{
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ph = (k + 1)/24;
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RAn[2] = ra0 + (k + 1)*(ra1 - ra0)/24;
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Dec[2] = dec0 + (k + 1)*(dec1 - dec0)/24;
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VHz[2] = test_hour(k, zone, t0, lat);
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RAn[0] = RAn[2]; // advance to next hour
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Dec[0] = Dec[2];
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VHz[0] = VHz[2];
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}
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// display results
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var sunrisevalue = zintstr(Rise_time[0], 2) + ":" + zintstr(Rise_time[1], 2);
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var sunsetvalue = zintstr( Set_time[0], 2) + ":" + zintstr( Set_time[1], 2);
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var message = special_message();
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var values = new Array();
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values.push(sunrisevalue);
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values.push(sunsetvalue);
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values.push(message);
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return values;
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}
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// Local Sidereal Time for zone
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function lst( lon, jd, z )
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{
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var s = 24110.5 + 8640184.812999999*jd/36525 + 86636.6*z + 86400*lon;
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s = s/86400;
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s = s - Math.floor(s);
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return s*360*DR;
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}
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// test an hour for an event
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function test_hour( k, zone, t0, lat )
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{
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var ha = new Array(3);
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var a, b, c, d, e, s, z;
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var hr, min, time;
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var az, dz, hz, nz;
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ha[0] = t0 - RAn[0] + k*K1;
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ha[2] = t0 - RAn[2] + k*K1 + K1;
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ha[1] = (ha[2] + ha[0])/2; // hour angle at half hour
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Dec[1] = (Dec[2] + Dec[0])/2 ; // declination at half hour
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s = Math.sin(lat*DR);
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c = Math.cos(lat*DR);
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z = Math.cos(90.833*DR); // refraction + sun semidiameter at horizon
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if (k <= 0)
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VHz[0] = s*Math.sin(Dec[0]) + c*Math.cos(Dec[0])*Math.cos(ha[0]) - z;
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VHz[2] = s*Math.sin(Dec[2]) + c*Math.cos(Dec[2])*Math.cos(ha[2]) - z;
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if (sgn(VHz[0]) == sgn(VHz[2]))
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return VHz[2]; // no event this hour
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VHz[1] = s*Math.sin(Dec[1]) + c*Math.cos(Dec[1])*Math.cos(ha[1]) - z;
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a = 2* VHz[0] - 4*VHz[1] + 2*VHz[2];
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b = -3* VHz[0] + 4*VHz[1] - VHz[2];
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d = b*b - 4*a*VHz[0];
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if (d < 0)
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return VHz[2]; // no event this hour
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d = Math.sqrt(d);
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e = (-b + d)/(2 * a);
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if ((e > 1)||(e < 0))
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e = (-b - d)/(2*a);
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time = k + e + 1/120; // time of an event
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hr = Math.floor(time);
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min = Math.floor((time - hr)*60);
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hz = ha[0] + e*(ha[2] - ha[0]); // azimuth of the sun at the event
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nz = -Math.cos(Dec[1])*Math.sin(hz);
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dz = c*Math.sin(Dec[1]) - s*Math.cos(Dec[1])*Math.cos(hz);
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az = Math.atan2(nz, dz)/DR;
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if (az < 0) az = az + 360;
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if ((VHz[0] < 0)&&(VHz[2] > 0))
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{
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Rise_time[0] = hr;
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Rise_time[1] = min;
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Rise_az = az;
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Sunrise = true;
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}
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if ((VHz[0] > 0)&&(VHz[2] < 0))
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{
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Set_time[0] = hr;
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Set_time[1] = min;
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Set_az = az;
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Sunset = true;
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}
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return VHz[2];
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}
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// check for no sunrise and/or no sunset
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function special_message()
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{
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if ((!Sunrise)&&(!Sunset)) // neither sunrise nor sunset
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{
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if (VHz[2] < 0){
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return "Sun down all day";
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}
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else{
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return "Sun up all day";
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}
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return "";
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}
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else // sunrise or sunset
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{
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if (!Sunrise)
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return "No sunrise this date";
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else if (!Sunset)
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return "No sunset this date";
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}
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}
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// sun's position using fundamental arguments
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// (Van Flandern & Pulkkinen, 1979)
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function sun( jd, ct )
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{
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var g, lo, s, u, v, w;
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lo = 0.779072 + 0.00273790931*jd;
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lo = lo - Math.floor(lo);
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lo = lo*2*PI;
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g = 0.993126 + 0.0027377785*jd;
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g = g - Math.floor(g);
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g = g*2*PI;
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v = 0.39785*Math.sin(lo);
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v = v - 0.01*Math.sin(lo - g);
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v = v + 0.00333*Math.sin(lo + g);
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v = v - 0.00021*ct * Math.sin(lo);
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u = 1 - 0.03349*Math.cos(g);
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u = u - 0.00014*Math.cos(2*lo);
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u = u + 0.00008*Math.cos(lo);
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w = -0.0001 - 0.04129*Math.sin(2*lo);
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w = w + 0.03211*Math.sin(g );
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w = w + 0.00104*Math.sin(2*lo - g);
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w = w - 0.00035*Math.sin(2*lo + g);
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w = w - 0.00008*ct*Math.sin(g);
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s = w/Math.sqrt(u - v*v); // compute sun's right ascension
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Sky[0] = lo + Math.atan(s/Math.sqrt(1 - s*s));
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s = v/Math.sqrt(u); // ...and declination
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Sky[1] = Math.atan(s/Math.sqrt(1 - s*s));
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}
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// determine Julian day from calendar date
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// (Jean Meeus, "Astronomical Algorithms", Willmann-Bell, 1991)
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function julian_day(date)
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{
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var a, b, jd;
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var gregorian;
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var month = date.getMonth() + 1;
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var day = date.getDate();
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var year = date.getFullYear();
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gregorian = (year < 1583) ? false : true;
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if ((month == 1)||(month == 2))
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{
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year = year - 1;
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month = month + 12;
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}
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a = Math.floor(year/100);
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if (gregorian) b = 2 - a + Math.floor(a/4);
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else b = 0.0;
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jd = Math.floor(365.25*(year + 4716))
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+ Math.floor(30.6001*(month + 1))
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+ day + b - 1524.5;
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return jd;
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}
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// returns value for sign of argument
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function sgn( x )
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{
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var rv;
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if (x > 0.0) rv = 1;
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else if (x < 0.0) rv = -1;
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else rv = 0;
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return rv;
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}
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// format a positive integer with leading zeroes
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function zintstr( num, width )
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{
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var str = num.toString(10);
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var len = str.length;
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var intgr = "";
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var i;
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for (i = 0; i < width - len; i++) // append leading zeroes
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intgr += '0';
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for (i = 0; i < len; i++) // append digits
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intgr += str.charAt(i);
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return intgr;
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}
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// format an integer
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function cintstr( num, width )
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{
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var str = num.toString(10);
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var len = str.length;
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var intgr = "";
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var i;
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for (i = 0; i < width - len; i++) // append leading spaces
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intgr += ' ';
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for (i = 0; i < len; i++) // append digits
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intgr += str.charAt(i);
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return intgr;
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}
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// format a real number
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function frealstr( num, width, fract )
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{
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var str = num.toFixed(fract);
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var len = str.length;
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var real = "";
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var i;
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for (i = 0; i < width - len; i++) // append leading spaces
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real += ' ';
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for (i = 0; i < len; i++) // append digits
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real += str.charAt(i);
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return real;
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}
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function setLocation(longitude, latitude){
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settings.setValue("longitude", longitude);
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settings.setValue("latitude", latitude);
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}
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return { //Public functions
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riseset: riseset,
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setLocation: setLocation
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}
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}(); |