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# MOA reticle versus Mildot...

#8
01-20-2006, 01:52 PM
 Gold Member Join Date: Sep 2003 Location: Blighty Posts: 637
Re: MOA reticle versus Mildot...

JB,

[ QUOTE ]
it is angular, not metric...just works out that way.

[/ QUOTE ]

Ian is correct; the mil is metric:

The International System of Units (abbreviated SI from the French language name Système International d'Unités) is the modern form of the metric system.

The radian is the SI unit of plane angle.

The SI system uses radians as the unit for angles. This is also roughly subdivided into the mil, which –as the link article by green 788 states - has several definitions in practice (although, to my memory, the Russians use 6000 not 6200mils to their circle).

Dredging my memory further; I have it logged somewhere in my brain that the military '6400 mil' was invented by the French when they developed the concept of indirect fire in WW1....yes, the 'cheese eating surrender monkeys' so popular in the US ( [img]/ubbthreads/images/graemlins/grin.gif[/img] ) invented the basis of the system in your scope reticles.

To answer Green's original question: The US military seem to do OK with metric maps. Set your laser to metres. Do your ballistic charts in metres. Problem solved [img]/ubbthreads/images/graemlins/grin.gif[/img]
#9
01-20-2006, 02:22 PM
 Platinum Member Join Date: Nov 2005 Posts: 1,088
Re: MOA reticle versus Mildot...

IMO, you range in 0.1 mils.
IMO, convert to yards or meters as the last step, not the first step.

A 20 inch target with an apparent size of 0.8 Mils
= 20 / .8 = 25
= 25 * 27.8 = 695 yards. ( inches to yards = *27.77777 )
If you don't mind being off by 8 yards @ 1000 yards then multiply times 28 instead of 27.8 )

edge.
#10
01-20-2006, 02:35 PM
 Platinum Member Join Date: Dec 2001 Location: Mukilteo, WA Posts: 1,092
Re: MOA reticle versus Mildot...

The Metric System came about in the 1790's. The US legalized its use in 1866. The Radian wasn't defined until 1873. It was a trig thing (eliminates the constant pi, greatly simplifies many equations, was simply a more natural and easier to use way of measuring angles when math is involved).
#11
01-20-2006, 02:37 PM
 Gold Member Join Date: Feb 2005 Posts: 563
Re: MOA reticle versus Mildot...

edge,

I see what you mean there, but the double digit multiplication would again be something that many folks (perhaps not all) would need a calculator or scratch paper for.

If I had a good scope with a mil reticle (well, actually I do have a good scope with mildots now that I think of it) I would use the mil ranging system.

However, for the reasons mentioned in my initial post, I chose an MOA reticle in my latest scope. I believe the ability to convert MOA subtention to yards out in my head is a decided advantage.

Dan
#12
01-20-2006, 03:06 PM
 Platinum Member Join Date: Feb 2005 Location: Nevada Posts: 2,782
Re: MOA reticle versus Mildot...

It’s all very interesting.
Here is my 0.02 cents!

A radian is a measure of the central angel subtended by an arc equal in length to the radius of the circle.

The word “mil” as used in mil-dot, stands for milliradian which is simply a radian divided by 1000. It is a one thousandth of a radian.

We know that the angle sustained in an arc of equal length to the radius, will have an angle equal to one RADIAN which is equal to 57.295780º. So if I divide this value by 1000 would tell me that a milliradian = 0.0573295780º degrees.

Now if I take the number of inches in 100 yards, (100x3*x12) = 3600”
3600 X Tangent of (0.0573295780º) = 3.6 inches. This is the distance of one mil-dot at 100 yards. This value, 3.6” is not along the arc, it is the vertical distance.

Based on this and my limited knowledge, I vote "yes" for the point the greeen man is trying to make. It sure makes a lot of sence to me. JMO [img]/ubbthreads/images/graemlins/smile.gif[/img]
__________________
-----------------------------

-----------------------------
HEBREWS 13:8
Jesus Christ the same yesterday, and to day, and for ever.

Our Lord Jesus said that as it was in the days of Noah and
also as it was in the days of Lot so it shall be in the days...
It's happening again!!! God sent to us His prophet, and His Word
to this generation and we once more are rejecting it as was prophesied!!!

---> As promised, God Sent His Prophet to us!
#13
01-21-2006, 10:51 AM
 Silver Member Join Date: May 2005 Location: Madrid - Spain Posts: 315
Re: MOA reticle versus Mildot...

I have problems with the MOA/MIL problem - like why is there one? -

I look through a mil scope - the adjustment required is 1/2mil - I have 1/10 mil adjustmets - 5 clicks is 1/2 mil end of story.

I look through a MOA scope - the difference is 1.5moa - I have a 1/4moa click scope - 6 clicks.

Maybe this is me - maybe it's the 1/2 bottle of red wine - but stop thinking inches/cms and think ANGLES. Just my opinion - &lt;hic&gt;.

Sorry if this hurts anybodies sentiments - but I'm a feet/inches (pre metric - pounds/shillings/pence) raised Brit living in metric Spain (and before Germany) - and if I can cope - so can anybody. After all, the USA has a metric monetary system.
__________________
Chris
#14
01-21-2006, 01:14 PM
 Platinum Member Join Date: Feb 2005 Location: Nevada Posts: 2,782
Re: MOA reticle versus Mildot...

It's the wine my friend,
I know and can visualize an "inch" but when you talk to me in cm, sure I could find out but in my head I'm not visualizing anything. That's with the fact that I was borne in Nicaragua and of course they use the metric system; I lived there for 20 years and I've been in this great country 30 years.
Besides those angles as you refer to, they're to be projected as vertical distances or they'd be pretty useless! [img]/ubbthreads/images/graemlins/smile.gif[/img]
__________________
-----------------------------

-----------------------------
HEBREWS 13:8
Jesus Christ the same yesterday, and to day, and for ever.

Our Lord Jesus said that as it was in the days of Noah and
also as it was in the days of Lot so it shall be in the days...
It's happening again!!! God sent to us His prophet, and His Word
to this generation and we once more are rejecting it as was prophesied!!!

---> As promised, God Sent His Prophet to us!

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