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

MeteorSkytype

What decides the meteors over the whole Earth at one moment, worked out once: the active showers with the places their radiants stand over, and the apex. hourlyRateAt reads it for each place, so a caller that asks about many places does the astronomy once.

Import it

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

Definition

interface MeteorSky {
    ms: number;
    showers: {
        shower: MeteorShower;
        zhr: number;
        overhead: [
            number,
            number,
            number
        ];
    }[];
    apex: [
        number,
        number,
        number
    ];
}

Members

NameTypeDescription
msnumber
showers{ shower: MeteorShower; zhr: number; overhead: [number, number, number]; }[]

The active showers, strongest first: the rate then, and the unit vector of the place the radiant is overhead.

apex[number, number, number]

The unit vector of the place that faces the Earth's way.

Examples

import { meteorSky, type MeteorSky } from "@johnmorrisdotca/chikyu-earth/meteors";

const sky: MeteorSky = meteorSky(Date.UTC(2026, 11, 14, 8));
console.log(sky.showers[0]?.shower.name); // "Geminids"
Geminids

What it prints (run when this page was built)

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