StarGazer

An embeddable night-sky explorer from the Theodore Roosevelt Presidential Library. On a phone or tablet it uses the motion sensors so you can hold the screen up to the sky and see what you are looking at; on a desktop you drag to look around. This page is the live preview and the embed instructions.

The card above is the embed. It detects whether the device has a motion sensor and offers a full-screen Start button either way.

Embed it

One line, anywhere in a page:

<script src="https://stargazer.labs.trlibrary.com/stargazer.js"></script>

The card renders where the script tag sits. To place it somewhere else, add a container and the script anywhere:

<div data-stargazer></div>
<script src="https://stargazer.labs.trlibrary.com/stargazer.js"></script>

Options on the container:

Attribute	Example	Meaning
data-lat / data-lon	data-lat="46.914" data-lon="-103.524"	Fix the observer location. Default is Medora; participants can also use their own location from Settings.
data-place	data-place="Elkhorn Ranch"	Label shown for a fixed location.
data-no-auto (on the script tag)		Do not insert a card automatically; only render into [data-stargazer] containers.

From JavaScript: StarGazer.open() opens the full-screen sky directly (call it from a click so motion permission and full screen are allowed).

What it shows

• About 5,000 stars to magnitude 6, with proper names and Bayer designations, and all 88 constellations with lines, names, and a short story each.
• The Sun, Moon with its true phase, and the planets Mercury through Neptune, computed on the device with no network calls.
• The Milky Way, bright star clusters, nebulae, and galaxies.
• Lakota, Dakota, Arikara, Hidatsa, Mandan, Ojibwe, and Pawnee star knowledge from published sources, marked as awaiting tribal partner review.
• Meteor showers active tonight with their radiants; a Tonight panel with sunset, darkness, moonrise, planets, and upcoming eclipses, conjunctions, and supermoons through 2028.
• An Aurora panel estimating tonight's chance of northern lights from the live NOAA planetary K index.
• Dark-sky design: dim palette, extra-dimming slider, and a red-light mode that protects night vision.