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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 · Ten famous spacecraft (Voyager, New Horizons, Pioneer, Cassini, Galileo, Juno, Parker Solar Probe, Webb): facts, events, and where each is at any date from launch to the end of its record

spacecraftSpeedfunction

A craft's speed relative to the Sun at a moment, in kilometres a second. Within about 3 per cent of Horizons' own figure at worst, and usually far closer.

Import it

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

Definition

function spacecraftSpeed(id: SpacecraftId, when: When): number

Parameters

NameTypeDescription
id"voyager1" | "voyager2" | "newhorizons" | "pioneer10" | "pioneer11" | "cassini" | "galileo" | "juno" | "parker" | "webb"

The craft.

whenWhen

A Date or milliseconds since 1970 (UTC).

Returns

number

The speed.

Examples

import { loadSpacecraft, spacecraftSpeed } from "@johnmorrisdotca/wakusei-planets/spacecraft";

await loadSpacecraft("voyager1");
console.log(spacecraftSpeed("voyager1", Date.UTC(2026, 10, 8)).toFixed(1), "km/s");
16.9 km/s

What it prints (run when this page was built)

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