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- Short: Display ephemerides for all the planets
- Author: ecdowney@noao.edu (Elwood Downey), Amiga port by uploader
- Uploader: haubi@geocities.com (Stefan Haubenthal)
- Version: 4.28 rel. 2
- Type: misc/sci
-
- Ephem is a program that displays ephemerides for all the planets plus any
- two additional objects. The additional objects may be fixed or specified
- via heliocentric elliptical, hyperbolic or parabolic orbital elements to
- accommodate solar system objects such as asteroids or comets.
-
- Information displayed about each object includes RA and Dec precessed to
- any epoch, local azimuth and altitude, heliocentric coordinates, distance
- from sun and earth, solar elongation, angular size, visual magnitude,
- illumination percentage, local rise, transit and set times, length of time
- up, constellation, and angular separations between all combinations of
- objects. A special detail of Jupiter's moons and central meridian
- longitude is also available.
-
- Observing circumstance information includes UTC and local date and time,
- local sidereal time, times of astronomical twilight, length of day and
- night, local temperature, pressure and height above sea level for the
- refraction model and a monthly calendar.
-
- RA/Dec calculations are geocentric and include the effects of light travel
- time, nutation, aberration and precession. Alt/az and rise/set/transit
- and, optionally, angular separation calculations are topocentric and
- include the additional effects of parallax and refraction.
-
- Plot and listing files of selected field values may be generated as the
- program runs. The plot files are full precision floating point values in
- ASCII intended for export to other plotting programs. The listing files
- are tables formatted for more general human reading. Ephem includes
- simple quick-look facilities to view these files.
-
- One may watch the sky or the solar system with a simple character-oriented
- screen display.
-
- Ephem may be asked to search for interesting conditions automatically,
- using several algorithms. Most fields displayed on the screen may be used
- as terms in an arbitrary arithmetic expression that can be solved for
- local zero or extrema, or the time of state change of any boolean
- expression can be found.
-
- The program is some 11,000 lines of C. It uses only a very simple set of
- io routines and should be easily ported to any 24x80 ASCII display. To
- date, it has been ported to several flavors of Unix, VMS, MS-DOS and,
- simplistically, the Macintosh using Think-C.
-
-
- ============================= Archive contents =============================
-
- Original Packed Ratio Date Time Name
- -------- ------- ----- --------- -------- -------------
- 174612 88162 49.5% 29-May-00 23:20:44 +ephem
- 143 123 13.9% 11-Dec-98 11:14:14 +ephem.cfg
- 12159 5138 57.7% 11-Dec-98 11:14:14 +ephem.db
- 77571 27242 64.8% 23-Dec-98 21:09:42 +ephem.guide
- -------- ------- ----- --------- --------
- 264485 120665 54.3% 04-Jun-100 08:34:12 4 files
-