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, small bodies (asteroids, 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, printing, and report generation. Access to the complete Bright Star Catalogue, a calendar conversion tool, 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-Touze and Chapront for the moon, both adjusted to Jet Propulsion Laboratory's DE404 (see www.moshier.net). 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 Eclipse Calculator (AEC) calculates the local circumstances of all solar and lunar eclipses that occur(ed) in the time range between -1999 (2000 B.C) and AD 3000. The local circumstances are presented as eclipse maps and tables for a list of locations. Locations can be selected from an extendable location database with more than 2000 entries. In addition reports of local circumstances of successive solar eclipses at a specified location can be generated.
Exporting maps for import into graphics applications is available as well as printing maps and tables. Different world maps and maps of all continents are included. For the calculation of "historical" eclipses nine different formulas for the determination of delta T (TD-UT) are provided.
Alcyone Eclipse Calculator can be used as a 'stand-alone application' or as an addition to Alcyone Ephemeris.
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