Night Hours Calculator

Calculate aircraft night hours based on location of departure and recovery and civil twilight.

Does not account for altitude changes. V2 will incorporate Meeus Astronomical Algorithms.

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Requirements

For development, you will only need Node.js

Node

• Node installation on Windows

  Just go on official Node.js website and download the installer. Also, be sure to have git available in your PATH, npm might need it (You can find git here).

• Node installation on Ubuntu

  You can install nodejs and npm easily with apt install, just run the following commands.

  $ sudo apt install nodejs
  $ sudo apt install npm
  

• Other Operating Systems

  You can find more information about the installation on the official Node.js website and the official NPM website.

If the installation was successful, you should be able to run the following command.

$ node --version
v8.11.3

$ npm --version
6.1.0

If you need to update npm, you can make it using npm! After running the following command, just open the command line again.

$ npm install npm -g

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Usage

Import into your project.

var nightCalc = require('./nighthourscalc'),

/**
*@param Date() depDate A date object of the local time of departure.
*@param Date() arrDate A date object of the local time of arrival.
*@param Number depLat Departure latitude in decimal.
*@param Number depLng Departure longitude in decimal.
*@param Number arrLat Arrival latitude in decimal.
*@param Number arrLng Ariival longitude in decimal.
*@return Object Returns a object {Number night (total night time), String error (can be null)}
**/

var depDate = new Date('2018-03-05T15:45:00'),
arrDate = new Date('2018-03-06T06:00:00'),
//Portland
depLat = 45.588611,
depLng = -122.5975,
//London
arrLat = 51.4775,
arrLng = -0.461389;

let nightCalculation = nightCalc.getTimes(depDate, arrDate, depLat, depLng, arrLat, arrLng);

let nightTime = nightCalculation.night;
let nightError = nightCalculation.error;