Coriolis Effect
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- AJMD429
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Coriolis Effect
Whenever I'm shoting an accurate, scoped, gun off a rest, and miss the 100 yard bullseye by more than a couple feet, I know it obviously can't be ME, so I usually blame the Coriolis effect (you know, the same effect the 1,000 yard shooters know will throw them off a half inch or so ).
But.....can I blame it if I'm shooting straight East or straight West...?
I get that if I'm shooting North, the bullet is being propelled northward, but also is going to the right around 1,000 miles per hour due to earth rotation, as if it is in a very-near-earth orbit. So if it travels for a whole minute, it would go 1000/60=16.6667 miles to the east in addition to its northward travel of 20 miles or so (assuming a really, really good ballistic coefficient.... ) but by then will be closer to the earth's axis, at a part of the earth maybe only travelling 999.9 mph to the east, so the earth under my bullet will only have travelled 99.9/60=16.6650 miles, and I'll be 0.0017 miles or about 9 feet off.
(...I know the numbers may be off but you get the idea...)
So if I do the same thing shooting to the South, the part of the earth I'm on may be the 999.9 mph part, and I'm shooting towards the 1,000 mph part, so it will move farther eastward than the bullet, making the bullet appear to beer right again, this time westward.
And if course all the opposite if I'm south of the equator.
But.....two questions for long-range competitors:
1. What, if any, effect happens if shooting straight East or west, and if there is an effect, why...?
2. Minimal effect would seem to exist near the equator, where 1,000 vs 999.9 mph may be the case, but if you were near the north pole, say about 3.8 miles out, so the circumference there was 24 miles, your eastward motion would only be one mile per hour, yet at 1.9 miles from the pole, only half that. A much larger difference, but much smaller numbers; do the effects of latitude cancel out, or must the long range shooter take into account latitude as well as (or not) compass direction.
Inquiring minds want to know...
Besides, like I said I plan to use all this as excuses next time I'm at the range....
But.....can I blame it if I'm shooting straight East or straight West...?
I get that if I'm shooting North, the bullet is being propelled northward, but also is going to the right around 1,000 miles per hour due to earth rotation, as if it is in a very-near-earth orbit. So if it travels for a whole minute, it would go 1000/60=16.6667 miles to the east in addition to its northward travel of 20 miles or so (assuming a really, really good ballistic coefficient.... ) but by then will be closer to the earth's axis, at a part of the earth maybe only travelling 999.9 mph to the east, so the earth under my bullet will only have travelled 99.9/60=16.6650 miles, and I'll be 0.0017 miles or about 9 feet off.
(...I know the numbers may be off but you get the idea...)
So if I do the same thing shooting to the South, the part of the earth I'm on may be the 999.9 mph part, and I'm shooting towards the 1,000 mph part, so it will move farther eastward than the bullet, making the bullet appear to beer right again, this time westward.
And if course all the opposite if I'm south of the equator.
But.....two questions for long-range competitors:
1. What, if any, effect happens if shooting straight East or west, and if there is an effect, why...?
2. Minimal effect would seem to exist near the equator, where 1,000 vs 999.9 mph may be the case, but if you were near the north pole, say about 3.8 miles out, so the circumference there was 24 miles, your eastward motion would only be one mile per hour, yet at 1.9 miles from the pole, only half that. A much larger difference, but much smaller numbers; do the effects of latitude cancel out, or must the long range shooter take into account latitude as well as (or not) compass direction.
Inquiring minds want to know...
Besides, like I said I plan to use all this as excuses next time I'm at the range....
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Want REAL change? . . . . . "Boortz/Nugent in 2012 . . . ! "
Re: Coriolis Effect
When shooting East with one of those new rifles using depleted Uranium rounds moving about 142,000 miles per second, you would need to put the target behind you.
D. Brian Casady
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Quid Llatine Dictum Sit, Altum Viditur.
Advanced is being able to do the basics while your leg is on fire---Bill Jeans
Don't ever take a fence down until you know why it was put up---Robert Frost
Re: Coriolis Effect
Judas Priest, Doc...go tumble some brass or something...
The Rotten Fruit Always Hits The Ground First
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Second Amendment Foundation
Citizens Committee For The Right To Keep And Bear Arms
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- 2ndovc
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Re: Coriolis Effect
Now that was FUNNY!!!!
jb
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- crs
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Re: Coriolis Effect
Thank you Blaine and Piller for putting this post into proper context.
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- Old Savage
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Re: Coriolis Effect
Just tell them you are a Dr. and you don't have be able to write legibly. They will have think there is some connection they don't know about.
- Old Savage
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Re: Coriolis Effect
BTW, magnetic north is moving toward Russia at about 40 miles per year. You will want to figure that into your calculations.
And don't forget precession but that takes like 25,960 years.
And don't forget precession but that takes like 25,960 years.
- GunnyMack
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Re: Coriolis Effect
Sun spots- those always factor in somewhere!
Full moon has an effect too...
Full moon has an effect too...
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Re: Coriolis Effect
If you're shooting west your bullet will travel with an increased velocity. The closer to a pole you get, you'll start shooting low.
Conversely, if you're shooting east, your bullet will lose velocity more quickly, and the closer to a pole you are the higher you'll shoot.
Conversely, if you're shooting east, your bullet will lose velocity more quickly, and the closer to a pole you are the higher you'll shoot.
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History teaches that it's a small window in which people can fight back before it is too dangerous to fight back.
History teaches that it's a small window in which people can fight back before it is too dangerous to fight back.
Re: Coriolis Effect
Doc,... You need a hobby, LOL
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Re: Coriolis Effect
Oh, "Coriolis Effect". Sorry, I misread that.