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Chikyu Earth地球

A line-drawn globe of the world's countries that turns at the Earth's own rate, with an optional realistic Earth from space and markers for any place.

Chikyu is the Japanese word 地球 for the Earth. About the name

Contents

Reference · The Earth-orbit catalogue: orbit class, object kind, colours, fleets and the packed file format (no data)

orbitShapefunction

The shape of an orbit from the two numbers every element set has: its mean motion (revolutions a day) by Kepler's third law, and its eccentricity. Heights are above the mean Earth radius (6371 km), the same as the satellites' own readout.

Import it

import { orbitShape } from "@johnmorrisdotca/chikyu-earth/catalogue";

Definition

function orbitShape(meanMotion: number, eccentricity: number): OrbitShape | null

Parameters

NameTypeDescription
meanMotionnumber

Revolutions a day, above 0.

eccentricitynumber

0 up to (not including) 1.

Returns

OrbitShape | null

The shape; null for a mean motion or an eccentricity that is not an orbit.

Examples

import { orbitShape } from "@johnmorrisdotca/chikyu-earth/catalogue";

const iss = orbitShape(15.4915, 0.0007139);
console.log(iss && Math.round(iss.perigeeKm), iss && Math.round(iss.periodMinutes), orbitShape(0, 0));
421 93 null

What it prints (run when this page was built)

View sourceEdit on GitHubMade from the source of @johnmorrisdotca/chikyu-earth 0.51.1.