Sky Guide (for Android Tablets and Phones)
Sky Guide is an astronomy app for sophisticated star enthusiasts and hobby astronomers who value well-founded and precise astronomical illustrations and data.
The basic app function displays a detailed and scalable celestial map with celestial objects (limit magnitude up to 6.3) that are visible with the naked eye or smaller telescopes. The place and time of observation as well as the direction of view can be manually configured by the user or automatically with the so-called “Live mode” (i.e. GPS, real-time and compass-guided).
Detailed additional information is available for every celestial object (fixed star, deep sky object, planet, moon, sun, meteorite shower). The information of the Bright Star Catalog and the Washington Double Star Catalog is made available for fixed stars. Additionally, users can add notes and links for every object.
The powerful search function makes it possible to align the map to a specific celestial object or guide the observer – in „live mode“ – to an object in the starry sky with specific notices. Searches can be performed according to the traditional name of an object, the catalog designation or the constellation. Moreover, the app makes it easy to identify celestial objects by aligning the device to the object in “Live mode”.
The functionality of the app is complemented by a number of astronomical tools and data.
Alcyone Ephemeris 4.3 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), planets, 18 natural satellites, and small bodies (minor planets and comets) in ecliptical, equatorial, and horizontal coordinates, 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 (Excel, HTML, XML, Text), scripting to write programs for more complex computations, and printing. 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-Touzé 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 Lunar Calculator
Alcyone Lunar Calculator (ALC) provides detailed astronomical information on the Moon. It calculates accurate geocentric or topocentric positional and physical ephemerides, times and circumstances of lunar events (e.g. lunar phases, perigee, apogee, passages through the nodes, first and last lunar visibility, occultations, eclipses), orbital parameters and more covering the time period AD 1200 to AD 2100.
Lunar topographic information are available by use of a high-resolution interactive image map based on images taken by NASA's Lunar Reconnaissance Orbiter Camera (LROC). In addition ALC offers graphical capabilities for data visualization in different kinds of printable and exportable 2D- and 3D-diagrams and projections (e.g. 3D-orbit diagram, libration diagram, visibility diagram, elevation maps).
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 (see www.moshier.net).
Alcyone Astronomical Tables
Alcyone Astronomical Tables 3.0 is a collection of astronomical data in electronic form. It provides detailed information on various astronomical phenomena (conjunctions with the Sun, planetary conjunctions, oppositions, stations, greatest eleongations, lunar phases, equinoxes and solstices, passages of aphelia and perihelia (apogee and perigee), transits, solar and lunar eclipses (including local circumstances) covering the period 3000 BC (2000 BC) to AD 3000. Alcyone Astrononomical Tables offers additional functionality as printing, chart generation, data export (Excel, HTML, ASCII, CSV), searching for specific values, and time range specification. The calculation (except eclipses) 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 (see www.moshier.net).
All eclipse predictions were performed by Fred Espenak and Jean Meeus (NASA's GSFC). As data are pre-calculated and saved in a database, all calculations are very fast. Alcyone Astrononomical Tables can be used as a 'stand-alone program' and/or as an addition to Alcyone Ephemeris.
Alcyone Eclipse Calculator
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 (see screenshots). Locations can be selected from an extendable location database with more than 2000 entries. In addition reports of local circumstances of successive solar or lunar eclipses at a specified location can be generated (see example).
Exporting maps for import into graphics applications is available as well as printing maps and tables (see example). Different world maps and maps of all continents are included. For the calculation of "historical" eclipses nine different formulas for the determination of DT (TD-UT) are provided.
Alcyone Solar Eclipse Calculator can be used as a 'stand-alone application' or as an addition to Alcyone Ephemeris.
The calculation of the local circumstances of solar eclipses is based upon the data from the Five Millenium Canon of Solar Eclipses -1999 to 3000 (Fred Espenak, NASA's GSFC) with Besselian Elements provided by Jean Meuus. The calculation of the local circumstances of lunar eclipses is based upon the data from the Five Millenium Canon of Lunar Eclipses -1999 to 3000 (Fred Espenak, NASA's GSFC).
Planetary, Lunar, and Stellar Visibility
Planetary, Lunar, and Stellar Visibility (successor to Planet's Visibility 2.0) presents a 3-color diagram that shows when a planet, a star, the moon or the sun is visible during any year from 3000 BC to AD 6000 at any location on the earth. The vertical axis marks the months of the year, the horizontal axis marks the hours of the day. The three colors create a contour map effect and show whether the body is under the horizon (black) and invisible, above the horizon with the sun (light color) and invisible, above the horizon without the sun (shaded color) and so possibly visible. The times of sunrise and sunset and when the sun reaches specified altitudes above or below the horizon can be shown as curves on the diagrams. By moving the mouse over the diagram, the date and time along with the object's altitude, azimuth, and magnitude, or the phase of the moon, are displayed. In addition, Planetary, Lunar, and Stellar Visibility computes and tabulates the dates of visibility phenomena: for planets and stars first and last visibility, acronychal rising and cosmical setting; for the moon first and last visibility, and the tables provide much supplementary information. These phenomena are very useful for historical purposes. Since the computation of visibility phenomena is complex and uncertain, alternate methods are provided and parameters can be altered by the user to find what appear to be the best results. There are also diagrams of solar and lunar eclipses, of the rotation, inclination, illumination, and apparent size of the bodies, and of Jupiter's satellites. The settings for the computations may be saved, the graphics may be saved, pasted into documents, and printed, and the tables for visibility phenomena may be accumulated, edited, printed, and saved as .rtf files or HTML files to be pasted into documents and printed.Full documentation is provided.Planetary, Lunar, and Stellar Visibility is freeware and runs under Windows 98, ME, 2000, XP, and Vista.