Elgin, Knowles & Senne, Inc.

310 E. 6th St.
Rolla, MO 65401









This description/specification is reprinted from our product description made at the time the software was being sold. It is provided as a historical reference. This software is NO LONGER AVAILABLE FROM US.



IBM PC Internal Ephemeris Diskette





GENERAL: ASTRO*DISK34 is a single diskette for the IBM and compatibles containing extremely accurate internal ephemeris generation for reduction of sun, Polaris and star observation data. The design period is through the year 2030 with no updates required. In addition there is a special algorithim for the sun and polaris from 2005 through 2030 that has accuracy suitable for first-order geodetic surveying. Based on the J2000 Epoch, all 1535 FK5 star coordinates can be accessed directly from an included file. Up to and including 34 pointings can be taken per observation.

INPUT/OUTPUT: Choice of input: manual interactive or read from a disk file. Choice of output: printer, screen or write to a disk file. Input data can be saved on disk. All files are in ASCII code and can be examined using the TYPE command or opened in wordpad.

COMPUTER CONFIGURATION: IBM PC or compatible, using MS-DOS, 256K RAM, printer not required but desirable. Can be used with or without a math coprocessor. Also can be run in the windows environment.

ACCURACY SPECIFICATIONS (design period 2005 through 2030 with no updates):
Maximum GHA error: 1.5" (98% of time <1.0"). Maximum declination error: 0.5". (Years 2005-2030.)
The above errors result in a maximum error in azimuth of 1.9 arc-seconds (98% of the time less than 1.4 arc-seconds) when the sun's altitude is at 40 degrees. Error decreases as altitude decreases. Within the design period of 1980 through 2005 this error will not exceed 0.2".
Within the design period of 2005 through 2030 maximum GHA error is 0.1" and maximum declination error is 0.01". Outside of this design period, azimuth errors in the mid latitudes may reach 0.4".
For stars whose delination is less than 70 degrees (north or south) the maximum GHA and declination error is 0.2".





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