David Harper wrote these web pages, including the software which drives
the interactive Blue Moon Calculator.
David has a B.Sc. in mathematics and astronomy from the University of London and a Ph.D. in applied mathematics from the University of Liverpool.
In his early career, he was a professional astronomer. He taught at the University of London and worked at the Royal Greenwich Observatory.
His areas of astronomical expertise are celestial mechanics (calculating the orbits of planets and satellites) and positional astronomy (calculating the positions of the Sun, Moon and planets).
He currently serves on two Commissions of the International Astronomical Union (the world governing body of astronomy) devoted to these fields.
These days, David is paid to do computational biology, though he continues to enjoy astronomy in his spare time.
If you would like to know more about David, you can read his
resumé.
Copyright © 1995-2002 by David Harper and Lynne Marie Stockman