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HAMCALL CD-ROM (Buckmaster)(April 1991).BIN
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1990-10-14
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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 5¼ inch disks or two 720 kilobyte 3½
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
media.
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