Quote:
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Originally Posted by Bill Nichols
Quote:
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Originally Posted by micky1up
sins in your head using clock face rule
imagine a clock
10mins past = 1/6th
15mins past -=1/4
20 past= 1/3
30 mins past easy = 1/2
40 =2/3
anything over 45 add 25 and call it a percentage
so distance of track atb 50 at 10000= 50 +25(over 45 add 25)call at percentage 75% dot =7500yds
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Another (equivalent) way to estimate sines is:
sin(X degrees) = X / 60
which works surprisingly well for X < about 45 degrees. |
My left brain says: "
Ugh!! Yuck! Up to 6% error. How horrible unprecise."
My right brain says: "Wow!
What a beautiful picture. This helps to get things in perspective"
I wonder which one is going to win this fight. Great help guys.