- Thread starter Rhongman
- Start date

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get a Scientific calculator and do the arccos.

Larger question being why?

understood......

That is why I am asking why?

Lindy also had a good comment some time ago on the math behind this. There is the quick and dirty cosine x distance. there is also another more accurate formula.

Angle Cosine Indicator on the scope base works because it gives both...uh oh, wait for it....

Angle AND Cosine

Sniper Tools original one has both then others hijacked and started making them with other options on the wheels

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Switchblade</div><div class="ubbcode-body">Angle Cosine Indicator on the scope base works because it gives both...uh oh, wait for it....

Angle AND Cosine

Sniper Tools original one has both then others hijacked and started making them with other options on the wheels </div></div>

Switchy........uuuummmmmmm......actualy.......no

http://www.snipertools.com/aci.htm

the ACI has done the math for you. The ADI gives you the angle from a 0 degree datum

Before the days of HH calculators, we used trig tables for conversion.

If you want a table, one can probably download off the internet, or make one in Excel using formulas. Since I had an inclinometer calibrated in degrees, made a table calculating for corrected distance.

If you "want to"

Get one of these.

No batteries required!

Gives more than what you asked for.

http://www.carrlane.com/TrigBook/TrigBookIndex.cfm

Why would you want to?

Because you can!

It's just simple triangles.

Geometry will help, trig will give numbers.

This book has been around before calculators!

Still works fine!

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ewoaf</div><div class="ubbcode-body">cosine X dope </div></div>

+1 this is more accurate than cosine x range

Here is degrees to corresponding cosine value:

degrees/cosine

05 — .99

10 — .98

20 — .94

30 — .87

40 — .77

50 — .64

60 — .50

70 — .34

80 — .17

90 — .00

Thanks to all who responded. I don't really NEED to know how to convert this, just wanted to know for the sake of knowing.

ggmanning: thanks for the conversion chart. I'm gonna save that. Sure it will come in handy someday.