Harold V. McIntosh
with assistance from
Saturnino Julio De La Trinidad H.
and the participation of
the Spring, 1993, Fortran III Class
Departamento de Aplicación de Microcomputadoras,
Instituto de Ciencias, Universidad Autónoma de Puebla,
Apartado postal 461, 72000 Puebla, Puebla, México.
August 30, 1993
GEOM is a collection of programs for drawing spheres and families of spheres. One application consists in constructing molecular models, wherein each atom is represented by a sphere of appropriate size. However, there are other applications; inasmuch as Puebla lay very near the center of the path of the memorable eclipse of June, 1991, there was considerable interest in studying the dynamics of the shadow cast by one spherical object onto another. Beyond individual applications, computer technology has evolved over the decades in which GEOM has been in devolopment, with the result that several different graphics strategies can be compared.