> When you estimate in degrees/sec, you are making two estimates. > You're estimating time and distance. Whereas with the NAMN > scale you are only estimating apparent time. How can a speed be estimated by time only? Am I faster when I drive 10 minuted or when I drive 5 minutes? A meteor lasting .2sec can have any geometrically reasonable angular speed say between 5 and 25 deg/s. Rainer