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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

certaintyOffunction

The certainty of a parallax known to a relative error (the error over the parallax): good under 5%, fair up to 20%, rough over it. With no error stated it is rough.

Import it

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

Definition

function certaintyOf(relativeError: number | undefined): Certainty

Parameters

NameTypeDescription
relativeErrornumber | undefined

The parallax's error divided by the parallax, or undefined.

Returns

Certainty

The certainty.

Examples

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

console.log(certaintyOf(0.01), certaintyOf(0.1), certaintyOf(0.5), certaintyOf(undefined));
good fair rough rough

What it prints (run when this page was built)

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