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@behaver/diurnal-parallax
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DiurnalParallax 是一个关于天体坐标的周日视差的计算组件,以转换站心与地心坐标
以天体月球为例,其周日视差的示意图:
通过 npm 安装,在你的 node 项目目录下执行:
npm i --save @behaver/diurnal-parallax
安装完成后,调用即可:
const DiurnalParallax = require('@behaver/diurnal-parallax');
const DiurnalParallax = require('@behaver/diurnal-parallax');
const { JDateRepository } = require('@behaver/jdate');
const SiderealTime = require('@behaver/sidereal-time');
const { SphericalCoordinate3D } = require('@behaver/coordinate/3d');
const Angle = require('@behaver/angle');
const angle = new Angle;
// 观测时间
let date = new Date('2003/08/28 11:17:00');
// 观测儒略时间
let jdate = new JDateRepository(date, 'date');
// 观测位置经纬
let obGeoLong = angle.parseDACString('116°51′50″').getDegrees();
let obGeoLat = angle.parseDACString('33°21′21″').getDegrees();
// 观测位置海拔高度,单位:千米
let elevation = 1713;
// 观测位置恒星时对象
let siderealTime = new SiderealTime(jdate, obGeoLong);
// 天体距离,单位:AU
let r = 0.37276;
// 天体球坐标 theta 值
let theta = angle.setDegrees(90 + 15.771083).getRadian();
// 天体球坐标 phi 值
let phi = angle.setDegrees(339.530208).getRadian();
// 天体位置球坐标
let gc = new SphericalCoordinate3D(r, theta, phi);
// 实例化周日视差
let dp = new DiurnalParallax({
gc: gc,
siderealTime: siderealTime,
obGeoLat: obGeoLat,
elevation: 1713,
});
// 获取站心球坐标
let tc = dp.TC;
constructor(options)
构造函数,接口同 init 方法
init(options)
初始化方法
规定参数:
options.gc 地心球坐标,参数类型为 SphericalCoordinate3D 对象 options.tc 站心球坐标,参数类型为 SphericalCoordinate3D 对象 options.obGeoLat 观测位置地理纬度,单位:度,值域:[-90, 90] options.siderealTime 观测位置的当地真恒星时对象,参数类型为 SiderealTime 对象 options.elevation 观测位置海拔高度,单位:米,值域:[-12000, 3e7]
set TC(tc)
设置站心球坐标对象
参数类型为 SphericalCoordinate3D 对象,规定参数球坐标中 r 值单位为:AU
get TC()
获取站心球坐标对象
set GC(gc)
设置地心球坐标对象
参数类型为 SphericalCoordinate3D 对象,规定参数球坐标中 r 值单位为:AU
get GC()
获取地心球坐标对象
The MIT license.
FAQs
The package is for calculating diurnal parallax.
The npm package @behaver/diurnal-parallax receives a total of 0 weekly downloads. As such, @behaver/diurnal-parallax popularity was classified as not popular.
We found that @behaver/diurnal-parallax demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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