I understand that ZHR can be misleading until you think about it a little. But we all use MPH as a measure of speed, even if we only maintain that speed from one stoplight to another. Andrew -- Andrew Cooper Tucson, AZ mailto:acooper@xxxxxxxxx http://whitethorn.house.home.att.net --- This message is from the AZ-Observing mailing list. If you wish to be removed from this list, send E-mail to: AZ-Observing-request@xxxxxxxxxxxxx, with the subject: unsubscribe. The list's archive is at: //www.freelists.org/archives/az-observing This is a discussion list. Please send personal inquiries directly to the message author. In other words, do not use "reply" for personal messages. Thanks.