Interactive Computer Ephemeris by gyvwpsjkko


									                     Interactive Computer Ephemeris

                         Nautical Almanac Office
                         U. S. Naval Observatory

                            Beta Version 0.50

This program, the Interactive Computer Ephemeris, is the successor to
the Floppy Almanac. This version of the Interactive Computer Ephemeris
allows computation of ephemeris data over a time span of approximately
250 years; the first valid date is December 21, 1800 and the last valid
date is June 7, 2049.     The fundamental ephemeris data has been highly
compressed in this new program.     Although 250 times as much ephemeris
data is provided in the Interactive Computer Ephemeris as in the Floppy
Almanac, only four 360 kilobyte 5¬ inch disks or two 720 kilobyte 3«
inch disks are needed to hold it.

This is a Beta version of the Interactive Computer Ephemeris; the
program is not yet in its final form. In particular, the user interface
will be changing. Many requests have been received and as many of them
as possible will be implemented. It is our plan to replace these Beta
versions at no cost to the original purchaser.      If you obtained your
copy from the Naval Observatory, you will be notified by mail when the
final version is available.

The Interactive Computer Ephemeris works by reading and expanding a
Compressed Ephemeris file it before it does any calculations. Briefly,
the ephemeris data for a time span of 4000 days is stored in a file
called EPMInn.DAT, where nn is a number from 01 to 24. For the
Interactive Computer Ephemeris to be able to find the necessary ephemeris
file, it must be in the current directory, on the current drive.   Not
all 24 of the ephemeris files need be present at any time.

An error message will be displayed if the file cannot be found.

The machine requirements for running this version of the Interactive
Computer Ephemeris are: IBM PC or compatible with 384 kilobytes of RAM.
MS DOS 2.1 or higher is necessary. A hard disk capable of holding all
the Interactive Computer Ephemeris files in a single directory is highly
recommended but is NOT required.   The arrangement of the files on the
360k disks is as listed below. Each pair of disks #1 and #2, and disks
#3 and #4 are combined onto a single 720k disk, when distributed on that
Disk #1: ICE     EXE
         PARAM   DAT
         EPH18   DAT
         EPH19   DAT
         READ    ME
         ICE     DFT

Disk #2: EPH20    DAT
         EPH21    DAT
         EPH22    DAT
         EPH23    DAT
         EPH24    DAT
         CATALOG EXE
         STAR1    CAT
         RADIO1   CAT
         MESSIER CAT
         SAMPLE   TXT

Disk #3: EPH01   DAT
         EPH02   DAT
         EPH03   DAT
         EPH04   DAT
         EPH05   DAT
         EPH06   DAT
         EPH07   DAT
         EPH08   DAT
         EPH09   DAT
         EPH10   DAT

Disk #4: EPH11   DAT
         EPH12   DAT
         EPH13   DAT
         EPH14   DAT
         EPH15   DAT
         EPH16   DAT
         EPH17   DAT

The first file in the list is the executable file comprising the
Interactive Computer Ephemeris.   At least three additional files are
required for execution.   These files are: PARAM.DAT, EPHnn.DAT, and
ICE.DFT.   EPHnn.DAT simply represents and one ephemeris data file. A
minimum of 1 of these files must be available to the Interactive
Computer Ephemeris if it is to be able to do any calculations. It is
required that these files be on the currently active disk.

To begin execution of the program, simply type the name ICE (or ice) and
press the 'ENTER' key.    The program will then be loaded into memory,
after which, the Interactive Computer Ephemeris masthead and main menu
will scroll onto the screen.

Since the Interactive Computer Ephemeris is menu- and prompt-driven, the
novice user can usually "feel" his way around its various options and
obtain useful information.   One can become fairly proficient in using
the Interactive Computer Ephemeris simply through a series of trial-and-
error runs.   Nevertheless, there is a significant amount of information
about how the program works which is not obvious but which is quite
important for all but the most casual user. This information is
contained in the Interactive Computer Ephemeris User's Guide
documentation distributed by the Naval Observatory with each Interactive
Computer Ephemeris disk.

If you have any problems with the software running on your machine please
put an explanation of the problem in the form of a letter giving exact
details about the nature of the problem, your hardware and software, and
any other pertinent information which may be needed to solve the problem.
Please include your mailing address and a daytime telephone number where
you may be reached.

We hope you find this Interactive Computer Ephemeris useful.

         Nautical Almanac Office
         Code FA
         U. S. Naval Observatory
         Washington, DC 20392

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