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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Angles *ARE* Ratios
From: Peter Fogg
Date: 2005 May 15, 13:23 +1000
From: Peter Fogg
Date: 2005 May 15, 13:23 +1000
Speaking of matters brought up recently, and since
Frank seems to be online, any chance of some more detail on this issue?
> As an aside, here's a
little mantra: Angles *ARE* Ratios.
> An angle of one
arcsecond is a ratio of 1:206,265. An angle of one
> arcminute is a ratio of
1:3438. And an angle of one degree is a ratio of 1:57.3.
> Memorize any one of
these and you never need trig for small angle
> calculations.
Thanks. If I recall, arc
divided by radius yields sine, tangent and angle (in radians) in small angles. Your
factor of 1:57.3 simply converts from rads to degrees. Yes? (Thank you, Bill)
