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* @author Patrick Schmiedel patrick.schmiedel@gmx.net
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* @classDescription This class represents an image of the sun at a
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* specific date and its characteristics.
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var SunImage = new Class.create();
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SunImage.prototype = {
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// The radius of the sun relative to the complete image
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* @param {Hash} options Available options: tileDir, tileSize, spacecraft, instrument, wavelength, resolution, maxZoomLevel, sunRadius, sunCenter, zoomLevelOffset, date
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initialize: function(options) {
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this.sunCenter = { x: 0.5, y: 0.5 };
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this.date = new SunImgDate();
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Object.extend(this, this.defaultOptions);
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Object.extend(this, options);
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* @classDescription Represents a date an image of the sun has been taken on.
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SunImgDate = Class.create();
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SunImgDate.prototype = {
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* @param {Hash} options Available options: year, month, day, hour, min, sec
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initialize: function(options) {
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Object.extend(this, this.defaultOptions);
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Object.extend(this, options);
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* @method secsSinceMidnight Returns the number of seconds since 0:00.
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* @return {Number} The number of seconds since 0:00.
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secsSinceMidnight: function() {
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Debug.output("secssincemidnight si");
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return String.parseInt(this.hour) * 3600 + String.parseInt(this.min) * 60 + String.parseInt(this.sec);
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* @method timeStr Returns the time of the image in a H:M:S format.
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* @return {String} The time as a string.
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return this.hour + ':' + this.min + ':' + this.sec;
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* TODO: Change name to be more correct (e.g. getAngle or so).
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* @method getObliquity Returns the angle of the earth towards the solar plane at this date.
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* @return {Number} The angle at this date.
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getObliquity: function() {
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Debug.output("getob si");
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var OBLIQUITY_DEGREES = (7.25).toRad();
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var MILLISECONDS_PER_YEAR = 31536000000;
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// Day the earth is at 0 degree to the sun (June 7th). Let's forget about leap years and higher-than-24-hours-precision for now.
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var d0UnixTime = Date.UTC(this.year, 6, 7);
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var dUnixTime = Date.UTC(this.year, this.month, this.day);
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return OBLIQUITY_DEGREES * Math.sin( (dUnixTime - d0UnixTime) / MILLISECONDS_PER_YEAR * 2 * Math.PI );
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* @method getRotationDeltaLongitude Returns the longitudal delta to the 0:00 value of a location
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* on the surface of the sun due to rotation, which depends on the
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* @param {Number} latitude The latitude of the location on the sun.
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* @return {Number} The longitudal delta.
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getRotationDeltaLongitude: function(latitude) {
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Debug.output("getrotationdelta");
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return ((this.secsSinceMidnight() / 86400) * (14.44 - 3 * Math.pow(Math.sin(latitude), 2))).toRad();
added
removed
lib/SunViewer/SunImage.js
