• This site is not directly affiliated with nor endorsed by NASA/JPL, but it uses NASA/JPL's powerful computational resources for public educational and personal astronomy applications.
  
  
• This web site features several demo PHP programs that are built to use publicly available NASA/JPL resources to perform customized astronomical computations on demand.  The PHP software is built around the NASA/JPL Horizons API in Pasadena, California, USA.
  
  
• The same NASA/JPL Horizons API that powers these programs also powers the on-line public Horizons interface at: https://ssd.jpl.nasa.gov/horizons/app.html
  
  
• The demo programs show users how they can create their own customized software to access the API functions more directly.
  
  
• All of the API-based software comes with complete, ready-to-run PHP (v8.2.12) public domain source code so that students of the API can study it, modify it in any way they wish and use it as a guide for creating their own customized Internet astronomy software.  It is very easy to do with PHP.
  
  
• I use an Apache web server package called XAMPP to develop the PHP software on a Windows 11 PC.  Then, after some testing, I post the demos on the web site.
  
  
• The software should be able to be run on any personal or public web site with PHP enabled. By installing a local web server with PHP enabled and with an Internet connection available to connect to the API, the software can also be run directly from the desktop via any standard web browser.  This allows for precise customization and personal from-home useage.
  
  
• Since the programs are mostly educational demos, to keep the code easy to follow, there may be a few minor bugs but nothing too critical.  The main purpose of the programs is to demonstrate how to make calls to the API via custom PHP programming.