J.F.Drew © 2000-2011
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Moon tracking DLL
A DLL to provide information about the moon or sun for program developers
The functions and procedures in VK5DJ_sunmoon.dll are derived from the work of the following people.
Inputs to the DLL are:
Date as Year, Month, Day
Time as Hour, Minute, Second
Station information as Height ASL (metres) , Latitude (decimal degrees with negative for southern hemisphere), Longitude (decimal degrees with negative for West of Greenwich)
Switches for Refraction effect of light, Sun/Moon choice
Band information for Doppler calculations
Outputs from the DLL are:
Azimuth and elevation of the body from the observer's perspective
Doppler shift of body at the band entered above
Distance of the remote body from the observer
Angular diameter of the body from the observer's perspective
Right ascension of the object (geocentric) in decimal hours
Declination of the object (geocentric)
Declination of the object topocentric
Libration in frequency spread (Hz)
Right ascension in HH:MM:SS
Polarity shift for antenna between stations
Decibels of loss referenced to closest distance of object
Distance of distant (DX) station on Great Circle path
Direction of distant (DX) station on Great Circle path
Locator derived from Lat/Long
Lat/Long derived from locator
Version number
Ever wanted to develop some software but doing all the moon and sun calculations was just too much. This little DLL does all the work for you. The purpose of the DLL is to provide an easily used platform for the calculation of the position of the sun or the moon and to provide the associated information often required for amateur radio operators interested in EME.
Due to the use of stdcall the DLL library should work with any of Windows versions of Delphi, Visual Basic, C and versions of these compilers designed for Linux. If your compiler does not accept the 10 byte extended type, use the second version “Download the Full Resource Double” compiled with ‘double’ floats. In the Resource ZIPs I provide an example interface (Test_DLL) written in Delphi to assist developers.
TestDLL front end- click for larger image
