Alcyone Ephemeris is an accurate and fast astronomical ephemeris calculator covering the period 3000 BC to AD 3000. It calculates heliocentric, geocentric, and topocentric positions of the Sun (Earth), Moon, planets, minor planets, comets and fixed stars in ecliptical, equatorial, and horizontal coordinates (including angular differences between two bodies), with optional corrections for parallax and refraction; rectangular coordinates, velocity, apparent diameter, magnitude, phase, lunar libration, orbital elements, differences for all of these, and more. In addition Alcyone Ephemeris offers a wealth of functionality: star chart generation, 3D-visualization of heliocentric and planetocentric orbits, plotting ephemeris data (as a function of time or in a parametric plot), searching for specific values, data export (HTML, Excel, Text, CSV, XML), printing, and (PDF-/HTML-/RTF-) report generation. Access to the complete Bright Star Catalogue, calendar conversion, and an astronomical event calculator are available.
The ephemeris calculation is based upon Steve Moshier's analytical ephemeris using trigonometric expansions for the earth and planets and the lunar ephemeris ELP2000-85 of Chapront-Touzé and Chapront for the moon, both adjusted to Jet Propulsion Laboratory's DE404. There are further adjustments in Alcyone Ephemeris, some optional, to JPL's more recent DE406, the most accurate long-term ephemeris. Alcyone Ephemeris is fast. With an Athlon XP 2000+ processor, 100 calculations of geocentric longitude, latitude, and distance for the sun, moon, and all planets take about 2 seconds.
A comprehensive documentation includes tabular and graphic comparisons of calculations with HORIZONS Ephemeris generator . Alcyone Ephemeris is shareware and runs under Windows 98/ME/2000/XP/Vista.

The Skygazer''s Almanac for Windows is a multifunctional tool for astronomers. You can get ephemerides of the planets, comets and minor planets as well as a list of remarkable events or ocultations. An observation planner is also included as a tiny planetarium.

• it allows you to see the observing conditions on a given night,
• it allows you to quickly compare activity on several nights and
• it allows you to compare activity during different parts of a night.

Includes a full featured Planetarium - yes, in .xls format and with all expected features: sky simulation; 3D solar system orrey, extended ephemerides tables for the planets and Moon (including a graph comparing it's apparent size etc...), graph depicting the visibility of the planets along a 24 hour period, ephemerides for all the Messier objects, Sun ephemerides with graphs, Jovian system simulation graphs, graphical simulation of Saturn, it's rings and satellites, day and night progression over an Earth map and a lot of miscellaneous calculations, including on the telescope optical parameters and CCD sides.

Note: requires MS Excel or compatible (the macros must be enabled).

Accurate Times calculates the following astronomical events:

• Islamic prayer times (Fajer, Shuroq, Dhohur, Aser, Maghreb, and Isha).
• Sun Times (Beginning and End of Twilight, Sunrise, Sunset, and Sun Transit).
• Moon Times (Moon rise, Moon transit, and Moon set).
• Moon phases (Geocentric or Topocentric).
• Crescent Visibility for both; New and Old crescents.
• Calculations for Sun and Moon Ephemeris.
• Qiblah direction (Direction to Ka'bah in Mecca).
• Qiblah time (The time at which the Sun or Sun's shadow is at the Qiblah direction).
• Hejric-Gregorian conversion.
• The prayer call (Athan) launches automatically when it is the time of the prayer.
• A reminder is heard few minutes before the next prayer.