diff --git a/readme.md b/readme.md index 158fed3..aa02c27 100644 --- a/readme.md +++ b/readme.md @@ -35,86 +35,87 @@ or minified file 日本語: [usage.ja.md](/usage.ja.md) ## Example - var date = new Date(); - - // Position of planets - var mars = new Orb.VSOP("Mars"); - var xyz = mars.xyz(date); // ecliptic rectangular coordinates(x, y, z) - var radec = mars.radec(date); // equatorial spherical coordinates(ra, dec, distance) - - // Position of the moon - var luna = new Orb.Luna(); - var xyz = luna.xyz(date); // Earth centered ecliptic rectangular coordinates (x, y, z) - var radec = luna.radec(date); // equatorial spherical coordinates(ra, dec, distance) - - // Apparent position of the Sun - var sun = new Orb.Sun(); - var xyz = sun.xyz(date); // Earth centered equatorial rectangular coordinates (x, y, z) - var radec = sun.radec(date); // equatorial spherical coordinates(ra, dec, distance) - - // Kepler orbital elements - var asteroid = new Orb.Kepler({ - "gm": 2.9591220828559093*Math.pow(10,-4), //(au^3/d^2) default value is the sun, so you can omit this line. - "eccentricity":"0.08728849329001058", - "inclination":"6.812676631845272", - "longitude_of_ascending_node":"250.5660658100269", - "argument_of_periapsis":"95.63473165761138", - "time_of_periapsis":"2456918.756066796", - "semi_major_axis":"1.001911878091084" - }); - var xyz = asteroid.xyz(date); // ecliptic rectangular coordinates(x, y, z, xdot, ydot, zdot) - var radec = asteroid.radec(date); // equatorial spherical coordinates(ra, dec, distance) - - // Cartesian state vectors to Kepler orbital elements - var orbital_elements = new Orb.CartesianToKeplerian(xyz) - - // Position of artificial satellites from Two Line Elements(TLE) - var tle = { - first_line:"1 25544U 98067A 15012.59173611 .00014829 00000-0 23845-3 0 7179", - second_line:"2 25544 051.6466 140.7335 0006107 243.2909 291.5211 15.53213268923827" - } - var satellite = new Orb.SGP4(tle); - var xyz = satellite.xyz(date); // Earth centered equatorial rectangular coordinates (x, y, z, xdot, ydot, zdot) - var latlng = satellite.latlng(date); // geographic spherical coordinates(latitude, longitude, altitude, velocity) - - // Azimuth and Elevation - var your_location = { - "latitude":35.658, - "longitude":139.741, - "altitude":0 - } - - var observe_mars = new Orb.Observation({"observer":your_location,"target":mars}); - var horizontal = observe_mars.azel(date); // horizontal coordinates(azimuth, elevation) - - var observe_satellite = new Orb.Observation({"observer":your_location,"target":satellite}); - var horizontal = observe_satellite.azel(date); // horizontal coordinates(azimuth, elevation) - - var sirius = { - "ra":6.75257, - "dec":-16.7131, - "distance":543300 - } - - var observe_star = new Orb.Observation({ - "observer":your_location , - "target":sirius - }); - var horizontal = observe_star.azel(date); // horizontal coordinates(azimuth, elevation) - - // Time conversion - var time = new Orb.Time(date); - var gmst = time.gmst(); - var julian_date = time.jd(); - var time_in_day = time.time_in_day(); - var day_of_year = time.doy(); - - // Coordinates conversion - var equatorial_rectangular = Orb.RadecToXYZ(sirius) - var ecliptic_rectangular = Orb.EquatorialToEcliptic({"date":date,"equatorial":equatorial_rectangular}) - var equatorial_rectangular = Orb.EclipticToEquatorial({"date":date,"ecliptic":ecliptic_rectangular}) - var equatorial_spherical = Orb.XYZtoRadec(equatorial_rectangular) - +```js +var date = new Date(); + +// Position of planets +var mars = new Orb.VSOP("Mars"); +var xyz = mars.xyz(date); // ecliptic rectangular coordinates(x, y, z) +var radec = mars.radec(date); // equatorial spherical coordinates(ra, dec, distance) + +// Position of the moon +var luna = new Orb.Luna(); +var xyz = luna.xyz(date); // Earth centered ecliptic rectangular coordinates (x, y, z) +var radec = luna.radec(date); // equatorial spherical coordinates(ra, dec, distance) + +// Apparent position of the Sun +var sun = new Orb.Sun(); +var xyz = sun.xyz(date); // Earth centered equatorial rectangular coordinates (x, y, z) +var radec = sun.radec(date); // equatorial spherical coordinates(ra, dec, distance) + +// Kepler orbital elements +var asteroid = new Orb.Kepler({ + "gm": 2.9591220828559093*Math.pow(10,-4), //(au^3/d^2) default value is the sun, so you can omit this line. + "eccentricity":"0.08728849329001058", + "inclination":"6.812676631845272", + "longitude_of_ascending_node":"250.5660658100269", + "argument_of_periapsis":"95.63473165761138", + "time_of_periapsis":"2456918.756066796", + "semi_major_axis":"1.001911878091084" +}); +var xyz = asteroid.xyz(date); // ecliptic rectangular coordinates(x, y, z, xdot, ydot, zdot) +var radec = asteroid.radec(date); // equatorial spherical coordinates(ra, dec, distance) + +// Cartesian state vectors to Kepler orbital elements +var orbital_elements = new Orb.CartesianToKeplerian(xyz) + +// Position of artificial satellites from Two Line Elements(TLE) +var tle = { + first_line:"1 25544U 98067A 15012.59173611 .00014829 00000-0 23845-3 0 7179", + second_line:"2 25544 051.6466 140.7335 0006107 243.2909 291.5211 15.53213268923827" +} +var satellite = new Orb.SGP4(tle); +var xyz = satellite.xyz(date); // Earth centered equatorial rectangular coordinates (x, y, z, xdot, ydot, zdot) +var latlng = satellite.latlng(date); // geographic spherical coordinates(latitude, longitude, altitude, velocity) + +// Azimuth and Elevation +var your_location = { + "latitude":35.658, + "longitude":139.741, + "altitude":0 +} + +var observe_mars = new Orb.Observation({"observer":your_location,"target":mars}); +var horizontal = observe_mars.azel(date); // horizontal coordinates(azimuth, elevation) + +var observe_satellite = new Orb.Observation({"observer":your_location,"target":satellite}); +var horizontal = observe_satellite.azel(date); // horizontal coordinates(azimuth, elevation) + +var sirius = { + "ra":6.75257, + "dec":-16.7131, + "distance":543300 +} + +var observe_star = new Orb.Observation({ + "observer":your_location , + "target":sirius +}); +var horizontal = observe_star.azel(date); // horizontal coordinates(azimuth, elevation) + +// Time conversion +var time = new Orb.Time(date); +var gmst = time.gmst(); +var julian_date = time.jd(); +var time_in_day = time.time_in_day(); +var day_of_year = time.doy(); + +// Coordinates conversion +var equatorial_rectangular = Orb.RadecToXYZ(sirius) +var ecliptic_rectangular = Orb.EquatorialToEcliptic({"date":date,"equatorial":equatorial_rectangular}) +var equatorial_rectangular = Orb.EclipticToEquatorial({"date":date,"ecliptic":ecliptic_rectangular}) +var equatorial_spherical = Orb.XYZtoRadec(equatorial_rectangular) +``` ## License Copyright (c) 2012-2017 Isana Kashiwai