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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

Contents

Reference · Facts, line drawings and positions

apparentfunction

How a body looks from the Earth at a time, from its real pole, rotation and the Sun's direction. A moon that keeps one face to its planet shows that face to the planet.

Import it

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

Definition

function apparent(id: BodyId, time: number): Apparent

Parameters

NameTypeDescription
idBodyId

The body's name.

timenumber

The instant, in milliseconds since 1970 (Date.now()).

Returns

Apparent

The pole, the prime meridian and the Sun's direction in the viewer's frame, with the phase and the size.

Examples

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

const saturn = apparent("saturn", Date.UTC(2026, 10, 2));
console.log(saturn.subObserverLat.toFixed(1), saturn.illumination.toFixed(2));
-6.5 1.00

What it prints (run when this page was built)

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