Hi, Suppose that one had to do simulations of an array on the Moon. Is this as simple as modifying $APLNOT/GEOPOS.FOR for UVCON? -- Joe -- Joseph Lazio, Ph.D. voice: +1-202-404-6329 Naval Research Laboratory fax: +1-202-404-8894 4555 Overlook Ave. SW Joseph.Lazio at nrl.navy.mil Washington, DC 20375-5351