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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 · The bodies nearest to a body on a date, in the sky or in space, and when two bodies come closest: nearest, within, closestApproach and conjunctions

SkyNeighbourtype

A body near the target in the sky: its angle from the target in degrees (0 to 180) and how far that angle may be off, in arc-seconds.

Import it

import type { SkyNeighbour } from "@johnmorrisdotca/wakusei-planets/nearest";

Definition

interface SkyNeighbour {
    id: BodyId;
    kind: NearestKind;
    angle: number;
    uncertaintyArcseconds: number;
}

Members

NameTypeDescription
idBodyId
kind"moon" | "star" | "planet" | "dwarf-planet"
anglenumber

The angle between the target and this body in the observer's sky, degrees.

uncertaintyArcsecondsnumber

The accuracy to expect of angle, in arc-seconds: the limits the accuracy tests hold the theories to, combined. An expectation, not a bound.

Examples

import { nearest, type SkyNeighbour } from "@johnmorrisdotca/wakusei-planets/nearest";

const next: SkyNeighbour | undefined = nearest("moon", { count: 1, date: Date.UTC(2026, 10, 8) })[0];
console.log(next?.id, next?.angle.toFixed(1));
venus 7.2

What it prints (run when this page was built)

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