NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Celestial Navigation without a sextant.
From: Marcel Tschudin
Date: 2008 Mar 12, 12:34 +0200
From: Marcel Tschudin
Date: 2008 Mar 12, 12:34 +0200
George, Sorry, I'm a bit late in replying. > > " ... According to Schaefer and Liller, the refraction at the horizon > > fluctuates by 0.3 degrees around a mean value normally, and in some cases > > apparently much more" The reference is to "Refraction near the horizon", > > Publ. astron. society of the Pacific, vol 102, pages 796 - 805 (July 1990). > > It would be nice to see more detail, but I don't have access to that > > original paper. Brad Schaefer is a recognised authority on optics in the The paper can be downloaded as pdf-file here: http://adsabs.harvard.edu/abs/1990PASP..102..796S If you should have a problem to obtain the paper from here, I also could send a copy of it to those who are interested. Note that a lot of these observations were done from higher altitudes. The observatory at Cerro Tololo is at 2215 m. Liller made the observations from his home location at Vina del Mar; the coordinates and altitudes mentioned in the paper were found to be wrong (thanks to Google Earth). In a mail he accepted the error and corrected it as follows: Lat. -32d 57' 28.1", Long. -71d 32' 45.3", Height 120m Marcel --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
