Calendar software - Windows program which creates sundials and calendars, see the dates and names of the year's moons, and calculate Easter.
Deepsky 99 - Software for Observers - [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.
Epoch_2000 Temporal Epoch Calculator - 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.
GeoAstro Applet Collection - [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.
JPL Planetary and Lunar Ephemerides - [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.
LunarPhase - [commercial, demo available - Win95/98/NT] A tool for displaying a variety of information on the Moon and aspects of its behaviour.
Moon Tool - [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.
Moonclock - [shareware - MacOS] Real-time graphical representation of the lunar visual aspect for any time/date/location. Elongation, PA bright limb, RA, DEC, percent illuminated, alt/az, heliocentric lat/long, distance, and radius.
Multiyear Interactive Computer Almanac - [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).
NGCView - [commercial, demo available - Win95/98/NT] Astronomical Observation Suite - Astronomical observation and logging software.
PyEphem - [open source - multiplatform] A module for performing astronomical computations using the Python scripting language.
