NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Michael Meredith
Date: 2012 Apr 29, 19:22 -0700
Nice! I'm envious.
I'm not a navigator, just someone curious and fascinated by the art and science. Thinking about the Air Canada flight again, I plugged their approximate position and time (N55W029/0700Z) into my astronomy software to get an idea of what they were looking at through the window. I'm trying to comprehend how their altitude affected the position of Venus in their field of view. To an observer on the ground at that location it looks like Venus was about 2.5° above the horizon. At 35,000' the horizon is roughly 220 nm distant. Projecting Air Canada's position 220 nm in the direction of Venus (Az 128°) takes us to approximately N52° 41' W024° 15'. At that location and time, Venus was several degrees higher. Would Air Canada's view of the sky be the same as someone's on the ground at N52° 41' W024° 15', at the same time?
Attached are a couple of screen shots from the software I'm using.
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