HP35S Distance to Horizon
Calculator: HP 35S
Sources:
* HP 65 Navigation Pac-1 - published in 1974
* Bad Astronomy by Discovery Magazine: http://blogs.discovermagazine.com/badastronomy/2009/01/15/how-far-away-is-the-horizon/#.UYCEhMu9KSM
* Wikihow Article: http://m.wikihow.com/Calculate-the-Distance-to-the-Horizon
Input
Height above sea level, the height includes the height of the land (if any) and the distance to your eyes or eyepiece.
Output
Approximate distance to the horizon in miles.
Conversions
If you use metric, use these conversions before/after running the program:
1 m = 3.28083989501 ft
1 mi = 1.609344 km
Formula
Updated formula based on radius on Earth on average 3,959 miles.
D ≈ √(1.49922*H + H^2)
H is in feet, D is in miles
Example
H = 3 ft, D ≈ 3.67392 miles
Program
H001 LBL H
H002 ENTER
H003 ENTER
H004 1.49922
H005 *
H006 x<>y
H007 x^2
H008 +
H009 √
H010 RTN
This blog is property of Edward Shore. 2013
A blog is that is all about mathematics and calculators, two of my passions in life.
Sunday, May 19, 2013
HP35S: Distance to Horizon
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