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Hoshi Stars星

The stars you can see without a telescope, with names, colours and distances; the 88 constellations with their lines and boundaries; the Messier objects; and seven map projections to draw them on.

Hoshi is the Japanese word 星 for a star. About the name

Contents

Reference · The sky out to a distance, in layers: the stars and galaxies nearer than 10, 50, 100, 500 or 1,000 light-years, each distance band its own colour, the ones with an uncertain distance kept apart, and none placed at a guess

limitFromTextfunction

The limit from the attribute distance-limit (and the address's dist), read as text: a number of light-years, or all. Off (undefined) when the attribute is missing, off, or not a number: nothing is limited and the sky is as it was, drawn with no layers.

Import it

import { limitFromText } from "@johnmorrisdotca/hoshi-stars/distance";

Definition

function limitFromText(value: string | null | undefined): number | undefined

Parameters

NameTypeDescription
valuestring | null | undefined

The text, or null when the attribute is missing.

Returns

number | undefined

The limit in light-years (Infinity for all), or undefined for no layers.

Examples

import { limitFromText } from "@johnmorrisdotca/hoshi-stars/distance";

console.log(limitFromText("100"), limitFromText("all"), limitFromText(null), limitFromText("far"), limitFromText("-5"));
100 Infinity undefined undefined undefined

What it prints (run when this page was built)

View sourceEdit on GitHubMade from the source of @johnmorrisdotca/hoshi-stars 0.47.0.