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@behaver/diurnal-parallax

The package is for calculating diurnal parallax.

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DiurnalParallax

GitHub license npm version PRs Welcome

简介

DiurnalParallax 是一个关于天体坐标的周日视差的计算组件,可用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:

周日月球视差

用例

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,
  siderealTime,
  obGeoLat,
  elevation,
});

// 获取站心球坐标
let tc = dp.TC;

API

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

许可证书

The MIT license.

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Package last updated on 11 Oct 2018

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