Links to Free Sites & Software

Astronomical Software created by Joe Novak. Here you will find his AstroClock FX, Double Star Database, and his Saguaro Database 8.1. The AstroClock FX displays the current local & UTC date & time, a calendar, local & Greenwich sidereal times, and the Julian day. The menus include information for the current sun, moon, eclipses, ephemerides for all the planets, minor planets and comets. It also has three timers that can be run independently. I personally think the AstroClock FX is one of the most informative astronomical java applications around. Take the time to check it out yourself. I'm sure most of you will agree.

Virtual Moon Atlas

This software, realized by Patrick Chevalley and Christian Legrand can visualize the Moon aspect for every date and hour and pilot computerized telescopes on the Moon surface. It permits also to study lunar formations with unique database of more than 8000 entries and a more than 6000 pictures library compiled by Christian Legrand.

TRIATLAS Second Edition

JR's website on Deep Sky Astronomy. Home of CnebulaX and The TriAtlas. The TriAtlas is a major reference, that includes 25, 90 and 661 charts (A, B and C sets), showing the night sky in a detail level larger than the Millennium Sky Atlas. Best of all it's FREE !

DeepSky Database

This site is an online observing list generator for amateur astronomers who love to pursue deep sky objects. It employs a web-based version of the Saguaro Astronomy Club's database (ver 7.2), consisting of over 10,000 records


DarkAdapted is an application program. It controls the amount of red, green, and blue in your screen gamma so that you may, for example, preserve your dark adaptation while using your computer.

Free Astronomy Software

David Paul Green's Free Astronomy Software site. Window/Mac/Palm software for logging your observations and finding Messier Objects. These include TUMOL: The Ultimate Messier Object Log, TSOL: The Simple Observing Log, OOLog: Overlooked Object Log (based on Brent Watson's book of the same name). Also TEC: The Eyepiece Calculator.

Excelsis Eyepiece Reviews

The question most often asked in amateur astronomy has to be "what's the best eyepiece for me" Excelsis has a large collection of actual user reviews of most every eyepiece you've ever heard of (and some you have not).

Ray Cash's Filter Performance

Light Pollution and various "nebula" filters have been around since the late 1970's, and amateurs have been using them ever since to bring out detail (and even some objects) which were difficult to impossible to see before in modest apertures. Which filter best suits your needs? Check out this site.

HNSKY Planetarium Program

HNSKY is a free planetarium program for Windows. It is complete with the SAO, PPM, Tycho-2 star databases, up to date deepsky database containing 26000 objects , Realsky (r) images and access to the external GSC and USNO CDROM star catalogs. Telescope control using the universal ASCOM package, a Realsky viewer (incl. source) DDE controlled from HNSKY and a BMP/JPEG to FITS conversion utility.


The free space simulation that lets you explore our universe in three dimensions. Celestia runs on Windows, Linux, and Mac OS X. Unlike most planetarium software, Celestia doesn't confine you to the surface of the Earth. You can travel throughout the solar system, to any of over 100,000 stars, or even beyond the galaxy.

SFA Star Charts

A basic set of all sky star charts. SFA star charts are designed to work anywhere on Earth. Instructions are included

Be an Astronomer Right from Your Window!

If you're interested in looking at the stars from home, there are several different techniques used to do so. Find out how here.