Links of Interest

Stellarium  (Windows)  Or Visit for the Mac Version

Here's a superb, FREE planetarium program! (SIS got special permission to provide this directly to you!)

Virtual Moon Atlas

This is the best lunar atlas I've seen and it's FREE!

FREE Education from M.I.T.? The REAL M.I.T.? YES!

It's 100% true. MIT has posted online all 1800 courses offered at the university. Any they're free. Please visit and support this incredibly generous gift from the world's premier science institution.

Searchable Asteroid Database

Everyone can use Sander Pool's excellent searchable database website to find Asteroid events near them..

Space Weather

Visit this site for up-to-date information about space weather.  Is the sun spewing protons at us? Will you see aurora tonight? Is a big asteroid coming in a bit too close? Visit Space Weather to find out! The current sunspot number is available here as well.

Pinhole Camera Solagraphy Project

This is not only very interesting but beautiful as well. I encourage EVERYONE to please visit this site! Great grass-roots project!

Dark Sky  

A good site, recommended by The Etna Astros. Great source for information about light pollution. This is also a great place to get information about outdoor lighting.

Earth & Sky 

Simple web site with basic sky watching information. Has a daily suggestion to look at. Gives basic observing tips.

PBS Jack Horkheimer's Site 

Has videos ( You need RealPlayer on your computer) of his show that are on PBS stations or just read the script part. Fun to look at! 

Index - Messier objects

Good site with thumbnail photos which link to information on each Messier object. You could spend days here, and the photos and information are great.

Heavens Above

If you're interested in seeing satellites or the International Space Station, you've come to the right place! It provides the times of visibility and detailed charts showing the satellite's track through the heavens. This is the site to find out when the International Space Station will pass over your location. It's worth registering---no charge.

Astronomy Picture of the Day 

Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

PLUS - go to the bottom of this site and have a look through the indexes. Really Fun!

The Astronomical League

The Astronomical League is composed of over two hundred and forty local amateur astronomical societies from all across the United States including our own Etna Astros!

Sky and Telescope Site

Sky charts, How-to's, - Basics, What is new and lots of interesting and helpful information.

The Constellations

Information relating to the 88 constellations. Read the background myths of each constellation of those constellations based on myth. Also find lots of data on many of the stars themselves, such as their visual magnitude, distance, etc. The are newly-made star charts, which now show the curvature of the sky as well as an accurate picture of all neighboring stars. These charts are similar to those found in the printed version of this web site.

The Constellations and their Stars

A page of links about Constellations, Stars, Messier objects, Photos. Lots of Sky stuff.

Great Photo Site

by Astro Photographer Frank Barrett. Well worth looking at!

Astronomy Now Online

The UK's Best-selling Astronomy Magazine. Containing articles on solar system, night sky, sky charts, alerts, store, spaceflight.

The Planetary Society 

Get the latest news on planetary research and exploration. Great site to gather information about the solar system and why the study of our solar is so important.

Sky Maps Downloads

One of our members recommended this site for a very good monthly sky chart and list of suggested targets.

Astronomy Equipment

Scope Stuff

This is THE place to look for that odd part or special adapter.


This the best place to find bargains! Registration is required but well worth it!

43 S Astro

This is THE place to get a Baader solar filter. Each filter is hand made from beautiful hardwood. Cost? You'll be surprised to learn these filters are about the same price as an aluminum cell from Kendrick.

Seymour Solar

SeeIntoSpace sells and highly recommends solar filters from Seymour Solar

Files You Can Use


Documents  (All PDF Files)


Astronomical League Goals