Interactive Java applets (JARS Top Rated!) display the position of the sun and the moon on the horizon for any date, time and location, and on a world map with day and night regions. The times of rise and setting, the declination, the Greenwich hour angle and the equation of time are computed ...

Advanced Auroral Activity and Space Weather Monitoring Software *NEW* Software: SWIM - The World's Most Advanced Space Weather Software System Monitor your local weather (cloud) conditions and solar activity as well ! All in real-time ! *NEW*: Read the Sky & Telescope Magazine Review of the old Version 2.0 STD Aurora Monitor Software Download the Trial Version Now Available on CD-ROM ORDER FORM ...

Freeware for Psion handhelds to help you find and track objects of the night sky. Well suited to Dobsonians.

Moontool for Windows ...

Willmann-Bell, Inc. publishers and booksellers serving the Astronomy Community since 1973.

There is a sky. There are things in the sky. This program draws maps of things in the sky.

SkySight UPDATE! 11 April 2001 You've waited... you've pondered... you've wondered: when will SkySight be released Wait no longer SkySight is here! After more than a year since our original announcement, Southern Stars Systems is releasing the current version of SkySight as a free public beta. We haven't yet implemented all of the features we'd have liked, and there are still a few kinks that ...

Download an Excel spreadsheet to calculate temporal variation in astronomic "constants, " obliquity of the ecliptic and illumination angles at specified latitudes.

Willmann-Bell, Inc. publishers and booksellers serving the Astronomy Community since 1973.