> > way, at 3.85 km range it's 7 centimeters in diameter ... I > > think! -- hummingbird or other very small bird size.) > > > So, if the Moon (or Sun) was 30 degrees above the horizon, the small > bird > would be flying at 1.9 km above your own elevation - how many small > birds > do? At 10 degrees elevation, this is 668.5 meters in altitude. At 45 degrees, 2.72 km in altitude, and at 60 degrees, 3.33 km. I think these altitudes are too high for a small bird. What about a larger bird? I don't remember how to calculate the inverse square law in reverse (at least I think that's the right mathematical route to take). ------------------------------ Jonathan T. Wojack tlj18@juno.com 39.706d N 75.683d W http://www.geocities.com/tlj18_99/ 5 hours behind UT (-5) ________________________________________________________________ GET INTERNET ACCESS FROM JUNO! Juno offers FREE or PREMIUM Internet access for less! Join Juno today! For your FREE software, visit: http://dl.www.juno.com/get/tagj. ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www2.satellite.eu.org/seesat/seesatindex.html
This archive was generated by hypermail 2b29 : Fri Jan 26 2001 - 16:42:12 PST