Skip to the content

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 · /meteors

apexPointfunction

The place on the Earth that faces the way the Earth is travelling round the Sun (the apex of its way): it sits on the morning side, which sweeps up more meteors than the evening side.

Import it

import { apexPoint } from "@johnmorrisdotca/chikyu-earth/meteors";

Definition

function apexPoint(ms: number): GeoPoint

Parameters

NameTypeDescription
msnumber

The moment, in milliseconds since the epoch.

Returns

GeoPoint

The longitude and latitude of that place, in degrees.

Examples

import { apexPoint } from "@johnmorrisdotca/chikyu-earth/meteors";

console.log(Math.abs(apexPoint(Date.UTC(2026, 2, 20, 12)).lat) < 24); // true: it stays within the tropics
true

What it prints (run when this page was built)

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