Credits & data sources

This site is built on open catalogs and open code. Every source that makes it work, and what each one provides here.

• ATHYG v3.2

  Star positions, distances and magnitudes for Fly Out's 3D field.

  License CC BY-SA 4.0

• Yale Bright Star Catalogue (BSC5P)

  The naked-eye stars drawn in the live sky and in Draw the Sky.

  License Public domain

• OpenNGC

  Deep-sky object sizes, types and coordinates for Tonight, For Your Scope.

  License CC BY-SA 4.0

• Stellarium sky cultures

  Constellation figures and names for the five cultures; each culture keeps its own license and attribution.

  License GPL-2.0 + per-culture terms

• CelesTrak (TLE data)

  ISS and satellite pass predictions in the ephemeris line.

  License Free reuse with attribution

• astronomy-engine

  All rise, set, transit and Moon-phase calculations, run in your browser.

  License MIT

• three.js

  The WebGL renderer behind Fly Out.

  License MIT

• IERS / USNO constants

  Sidereal time and precession constants used to place the sky.

  License Public domain

• Inter

  The typeface used for every word on this site.

  License SIL Open Font License 1.1

• Your browser

  Does all the computing. Nothing is sent to a server, because there isn't one.

  License —