300 miles visibility on Antartica?

Code-Beta

New Member
I found a strange thing in goverment document named "Sailing Directions (Planning Guide and Enroute)".

It says that mountains were sighted up to 300 miles away. Assuming observer is at "Crow Nest" at 115 ft ( 35m),Refracted hidden will be 8.83 miles. The highest mountains on Antarctica are 2.9 miles tall. Also, refraction is minimal at higher altitudes,like "Crow Nest".

Metabunk 2020-02-22 16-47-30.jpg

Here is document if anyone wants to check(search for 300 miles inside document,and you will find it)

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=2ahUKEwiguvK7qObnAhUhpIsKHQ5ABXgQFjAAegQIBRAB&url=https://msi.nga.mil/api/publications/download?key=16694492/SFH00000/Pub200bk.pdf&usg=AOvVaw3uNdTE9SkbFJEQyMOatWy-
 
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Mick West

Administrator
Staff member
Assuming observer is at "Crow Nest" at 115 ft
Why are you assuming that?

Also, refraction is minimal at higher altitudes,like "Crow Nest".
That makes no sense. The important thing is the line of sight. The article describes what is going on - looming. The extreme temperature variations and clean air make Antarctica a prime location for optical phenomena.
 

Mick West

Administrator
Staff member
And this "300 miles" isn't exactly a scientific observation - it seems more like an anecdote.
 

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