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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 · Julian dates (and the julian package's functions), calendars, time scales, sidereal time and Mars time

ttMinusUtcfunction

Terrestrial time minus the clock's time, in seconds, at a moment given in UTC: 69.184 from the last leap second in 2017 on (until another is added), exact from 1972, and delta T before.

Import it

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

Definition

function ttMinusUtc(when: When): number

Parameters

NameTypeDescription
whenWhen

A Date or milliseconds since 1970 (UTC).

Returns

number

Seconds to add to UTC to get TT.

Examples

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

console.log(ttMinusUtc(Date.UTC(2026, 10, 7)));
69.184

What it prints (run when this page was built)

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