NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Bubble horizon
From: Marc Bernstein
Date: 2002 Dec 16, 15:49 -0500
From: Marc Bernstein
Date: 2002 Dec 16, 15:49 -0500
I assume most of us are using the "practice bubble horizon" sold by Celestaire. The key word here is 'practice'. It is not particularly easy to sight through and the bubble is quite wobbly. The main problem appears to be a lack of fluid dampening. Based upon my experience 7 minutes is not bad. I often get accuracies of 10-15 minutes. Maybe I need more practice. By the way if you hold a flashlight in just the right spot, it is possible to illuminate the bubble from the outside so you can use the practice bubble at night also. This only works with the Moon. There is not enough light transmission to sight a star, and no magnification. But for those of us who are landlocked it is still worth it.