Earth position is calculated using the series calculated by J. Chapront and G. Francou from the Bureau des longitudes. The series are derived by the frequency analysis of the JPL numerical integration DE403 . It is provided as a service for interested users to be accessed over the Internet. Eventually it may be released in a source code form if enough people express interest. In contrast of WWW interface, which may be easier to use, direct access is much faster.
Users are welcome to register.
This service is provided for free, however due to possible problems with buggy client programs I need to be able to selectively exclude some users. Also, for each user observatory coordinates are maintained so that they need to be typed in only once. Most of the commands are followed by some parameters. Parameters are separated by white spaces. Alternatively, it can be specified as a Julian Day using format jdnnnnnnn.nn .