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Wakusei Planets惑星

The Sun, the planets and their moons as a clean line drawing, a shaded realistic drawing or a painted surface map, with real sizes, tilt and rotation, and the moons where they are at any date and time.

Wakusei is the Japanese word 惑星 for a planet. About the name

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Reference · Bodies as objects for your own three.js scene

moonOffsetfunction

Where a moon is from its planet's centre, in planet radii, in the scene's axes (x to the vernal equinox, y north).

Import it

import { moonOffset } from "@johnmorrisdotca/wakusei-planets/painter";

Definition

function moonOffset(id: MoonId, ms: number): Vec3

Parameters

NameTypeDescription
id"moon" | "phobos" | "deimos" | "io" | "europa" | "ganymede" | "callisto" | "mimas" | "enceladus" | "tethys" | "dione" | "rhea" | "titan" | "iapetus" | "miranda" | "ariel" | "umbriel" | "titania" | "oberon" | "proteus" | "triton" | "nereid" | "charon" | "nix" | "hydra" | "vanth" | "hiiaka" | "namaka" | "dysnomia"

The moon's name.

msnumber

The instant, in milliseconds since 1970.

Returns

Vec3

The offset, in radii of the planet the moon goes round.

Examples

import { moonOffset } from "@johnmorrisdotca/wakusei-planets/painter";

const [x, y, z] = moonOffset("io", Date.UTC(2026, 10, 2));
console.log(Math.hypot(x, y, z).toFixed(1));
5.9

What it prints (run when this page was built)

View sourceEdit on GitHubMade from the source of @johnmorrisdotca/wakusei-planets 0.24.0.