Handling Astronomical Dates and Times
PHP Programs by Jay Tanner of Geneva, NY, USA - 2026
These Julian Day Number Tools Spans some 40,000 years and can
also handle negative Julian Day Numbers.
Some Horizons ephemerides can reach from nearly 10,000 BC up
to 10,000 AD.
The native built-in Julian Day Number functions of PHP do not handle negative Julian Day numbers.
also handle negative Julian Day Numbers.
Some Horizons ephemerides can reach from nearly 10,000 BC up
to 10,000 AD.
The native built-in Julian Day Number functions of PHP do not handle negative Julian Day numbers.
These programs are powered by the same API used by the on-line web application at
https://ssd.jpl.nasa.gov/horizons/app.html
All of the rules that apply to the NASA/JPL Horizons on-line application also apply to all of these programs as well.
https://ssd.jpl.nasa.gov/horizons/app.html
All of the rules that apply to the NASA/JPL Horizons on-line application also apply to all of these programs as well.