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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What does MOA means?
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<blockquote data-quote="Trickymissfit" data-source="post: 1150820" data-attributes="member: 25383"><p>dang Bart, I thought I caught you in an error, but you got it right. For all practical purpose a minute of angle is 1.048". Most folks think it's one inch.</p><p></p><p>Arc minutes, seconds, or I guess even hours are nothing new, and have always been there. We didn't know how to use them a few decades back. Yet other folks used the numbers daily. Astronomers', NASA, and a few very finite machining concepts did. Yet the numbers don't really compare totally with a measurement we normally go by; even though they really do in the end. So when you see the term "Arc" in relationship to measurement, you know it's finite. So when your making measurements in the .000050" and smaller ranges, you normally forget about what we take for granted and speak of arc seconds and so on. (an arc second computes to .000048" in one foot length). This is measured by light refraction, as a laser isn't all that perfect. Yet a low powered light beam is nearly perfect (yes light will bend in an infinite length). Still if you booking a flight to Mars, you pretty much figure they've got everything figured to one thousandth of an arc second just to get you in the neighborhood of the place.</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 1150820, member: 25383"] dang Bart, I thought I caught you in an error, but you got it right. For all practical purpose a minute of angle is 1.048". Most folks think it's one inch. Arc minutes, seconds, or I guess even hours are nothing new, and have always been there. We didn't know how to use them a few decades back. Yet other folks used the numbers daily. Astronomers', NASA, and a few very finite machining concepts did. Yet the numbers don't really compare totally with a measurement we normally go by; even though they really do in the end. So when you see the term "Arc" in relationship to measurement, you know it's finite. So when your making measurements in the .000050" and smaller ranges, you normally forget about what we take for granted and speak of arc seconds and so on. (an arc second computes to .000048" in one foot length). This is measured by light refraction, as a laser isn't all that perfect. Yet a low powered light beam is nearly perfect (yes light will bend in an infinite length). Still if you booking a flight to Mars, you pretty much figure they've got everything figured to one thousandth of an arc second just to get you in the neighborhood of the place. gary [/QUOTE]
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What does MOA means?
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