My best guess is that the close encounter occurred on Orbit 16.8 of STS-72 over Central Australia at 09:22 UTC 12 Jan 1996. Both vehicles were at an altitude of approximately 223 naut. miles. One of my programs showed a separation of less than 7 miles with updates every one second. A higher calculation rate would ,I think, show a closer encounter. Anyone else have an opinion? Sure would be nice to have a program calculating future encounters. ---------------------------------------------------------------- Jeff Hunt, Charlotte Hall, Md. 38.51N, 76.76W E-mail: jhunt@eagle1.eaglenet.com ----------------------------------------------------------------