| 1 | /**
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| 2 | * @fileOverview
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| 3 | * Documentation of Local class built into dimctrl.
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| 4 | */
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| 5 |
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| 6 | /**
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| 7 | * @class
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| 8 | *
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| 9 | * A set of coordinates on the celestial sphere.
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| 10 | *
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| 11 | * The class stores a set of coordinates on the celestial, i.e. local,
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| 12 | * sky. If the data was the result of a coordinate transformation, the
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| 13 | * corresponding time is stored in addition. Functions to convert to sky
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| 14 | * coordinates and to measure distances on th sky are included.
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| 15 | *
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| 16 | * @param {Number} zenithDistance
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| 17 | * Zenith angle in degree (Zenith=0deg)
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| 18 | *
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| 19 | * @param {Number} azimuth
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| 20 | * Azimuth angle in degree (North=0deg, East=90deg)
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| 21 | *
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| 22 | * @example
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| 23 | * var local = new Local(12, 45);
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| 24 | * var sky = local.toSky();
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| 25 | *
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| 26 | * @author <a href="mailto:thomas.bretz@epfl.ch">Thomas Bretz</a>
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| 27 | *
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| 28 | */
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| 29 | function Local(zenithDistance, azimuth)
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| 30 | {
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| 31 | /**
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| 32 | * Zenith distance in degree (Zenith=0deg)
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| 33 | *
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| 34 | * @constant
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| 35 | *
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| 36 | * @type Number
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| 37 | */
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| 38 | this.zd = zenithDistance;
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| 39 |
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| 40 | /**
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| 41 | * Azimuth in degree (North=0deg, East=90deg)
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| 42 | *
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| 43 | * @constant
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| 44 | *
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| 45 | * @type Number
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| 46 | */
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| 47 | this.az = azimuth;
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| 48 |
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| 49 | /**
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| 50 | * Time corresponding to ra and dec if they are the result of
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| 51 | * a conversion.
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| 52 | *
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| 53 | * @constant
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| 54 | * @default undefined
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| 55 | *
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| 56 | * @type Date
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| 57 | */
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| 58 | this.time = undefined;
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| 59 |
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| 60 |
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| 61 | /**
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| 62 | * Convert celestial coordinats to sky coordinates.
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| 63 | * As observatory location the FACT telescope is assumed.
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| 64 | * The conversion is done using libnova's ln_get_equ_from_hrz.
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| 65 | *
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| 66 | * @constant
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| 67 | *
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| 68 | * @param {Date} [time=new Date()]
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| 69 | * Reference time for the conversion
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| 70 | *
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| 71 | * @returns {Sky}
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| 72 | * A Sky object with the converted coordinates and
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| 73 | * the corresponding time.
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| 74 | */
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| 75 | this.toSky = function() { /* [native code] */ }
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| 76 |
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| 77 | /**
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| 78 | * Calculate the distance between two celestial sky positions.
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| 79 | *
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| 80 | * The distance between this object and the provided celestial
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| 81 | * position on the sky is calculated. The returned value
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| 82 | * is an absolute distance (angle) between the two positions.
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| 83 | *
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| 84 | * @constant
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| 85 | *
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| 86 | * @param {Local} local
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| 87 | * Celestial coordinates to which the distance on the sky
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| 88 | * should be calculated. In principle every object with
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| 89 | * the properties 'zd' and 'az' can be provided.
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| 90 | * @param {Number} local.zd Zenith distance of the object
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| 91 | * @param {Number} local.az Azimuth of the object
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| 92 | *
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| 93 | * @returns {Number}
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| 94 | * Absolute distance between both positions on the sky in degrees.
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| 95 | */
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| 96 | this.dist = function() { /* [native code] */}
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| 97 | }
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