John Stephen offers Full Moon, a moon phase calculator, and Full Sun, easy-to-use software programs for amateur and home astronomers.

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

[opensource - POSIX] There is a sky. There are things in the sky. This program draws maps of things in the sky.

[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 - 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).

[Windows] A desktop application that displays the times of the various phases of the moon and a picture of the current phase of the moon.

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

Offers Four By Jove, software that provides precise information on the location of the four main moons of Jupiter. Also AstroVizier, which provides a precise and detailed physical ephemeris for the major bodies of the solar system.

[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.

Simon Dawes provides a collection of public domain freeware written as observing aids for the enthusiastic amateur astronomer.

[commercial and freeware - multiplatform] Interactive Java applets display the position, daily and annual path of the sun and the moon, for any time and location.

Excel spreadsheet calculates temporal variation in astronomic constants, obliquity of the ecliptic, and illumination angles at any specified latitude. You need only input a date or the latitude.

[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.

Astronomical observation planning, logging, reporting, and telescope control software for imagers and visual observers.

[freeware - Linux] Command-line program to automate reduction of variable star CCD images.

[open source - multiplatform] Development and integration of tools and numerical algorithms into the Python scripting language.