Freeware for handheld computers to help find and track objects of the night sky.

[shareware - Win95/98/NT] Deepsky 99 solves an important need for amateur and professional observers. The software allows the user to plan a productive observing session and record what was observed quickly and easily.

[commercial - multiplatform] This CD contains three Jet Propulsion Laboratory Planetary and Lunar Ephemerides along with a toolbox of FORTRAN subroutines that allow the user to obtain the coordinates of the Sun, Moon, and nine major planets.

[commercial - Win95/98/NT/2000] Advanced auroral activity monitoring software.

[open source - multiplatform] A module for performing astronomical computations using the Python scripting language.

[commercial, demo available - Win95/98/NT] Astronomical Observation Suite - Astronomical observation and logging software.

[commercial, Win/Mac] CCD camera control and image processing, includes SkyChart III.

Windows program which creates sundials and calendars, see the dates and names of the year's moons, and calculate Easter.

[commercial - DOS, Macintosh] A software system that provides high-precision astronomical data in tabular form for a wide variety of objects; it calculates much of the information tabulated in the benchmark annual publication, The Astronomical Almanac, but it goes beyond traditional almanacs by enabling you to calculate data for specified locations at specified times within a fifteen year interval (1990-2005).

[commercial, demo available - Win95/98/NT] A comprehensive tool for displaying a variety of information on the Moon and aspects of its behaviour.