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Simon1994PlanetaryPositions

Simon1994PlanetaryPositions是基于Simon J.L.(1994)所描述的天体位置算法的CesiumJS插件。

该插件提供精确的太阳系行星位置和月球位置信息,包括以下信息:

  • 行星位置:水星、金星、地球、火星、木星、土星、天王星和海王星
  • 月球位置:地球半径以上和月球坐标系中位置等价于海王星轨道面

安装

你可以使用npm下载安装cesium-simon1994-planetary-positions:

npm install cesium-simon1994-planetary-positions --save

在你的CesiumJS应用程序内的Modules文件夹中,拷贝 Simon1994PlanetaryPositions.js 到自己的模块里。

然后在CesiumJS程序内,导入刚刚拷贝到的模块:

import * as Simon1994PlanetaryPositions from './Modules/Simon1994PlanetaryPositions';

使用

一旦安装了 Simon1994PlanetaryPositions,你就可以轻松地通过以下代码获取特定天体的位置:

let positionOfTheSun = Simon1994PlanetaryPositions.getPositionOf('sun', new Date());

getPositionOf 方法

getPositionOf 方法是 Simon1994PlanetaryPositions 提供的主要方法,它可以通过下列参数访问太阳系行星或月球的位置数据:

参数 类型 默认值 描述
name 字符串 行星或月球名称
inputDate 日期 具体日期

下面是获取所有行星位置的例子:

let date = new Date();
let positions = [];
for(let i = 0; i<Simon1994PlanetaryPositions.planetaryNames.length; i++){
    positions.push(Simon1994PlanetaryPositions.getPositionOf(Simon1994PlanetaryPositions.planetaryNames[i],date));
}

行星名字

具体的行星名字请查阅 ./Scripts/Simon1994PlanetaryPositions.js ,其中包括以下八种行星:

  • mercury: 水星
  • venus: 金星
  • earth: 地球
  • mars: 火星
  • jupiter: 木星
  • saturn: 土星
  • uranus: 天王星
  • neptune: 海王星

更新正确的时间

为了提供精确的行星位置数据,使用 Simon1994PlanetaryPositions 前确保使用正确的时间。

例如:

let date = new Date("2022-04-15T01:59:00Z");
let positionOfVenus = Simon1994PlanetaryPositions.getPositionOf('venus', date);

参考文献

  • Simon J. L. (1994), Poynting–Robertson effect and solar radiation pressure for finite spherical and nonspherical particles, Icarus vol. 111, pp. 267-281.