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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Zero shift on travel to new location.
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<blockquote data-quote="isaaccarlson" data-source="post: 506774" data-attributes="member: 33850"><p>Gravity changes, yes. We have all heard of the Coriolis Effect. The earth is spinning at about 1,000 miles per hour at the equator. That is fast. If you shoot north or south at the equator, you should have almost no Coriolis Effect as the target and you are moving at or near the same speed and the target is not rising or dropping in relation to you. Hold on I am getting there....</p><p></p><p>If you shoot east, your bullet should hit high since the earth rotates to the east and the target is dropping in relation to you. If you shoot west, your bullet should hit low. Get it?</p><p></p><p>You are standing on a ball that is spinning. When the bullet leaves the gun, it will continue to travel toward the original target location. The earth does not stop spinning when we shoot, so the angular relationship between you and the target is ALWAYS changing. Lets say, just for an example, that the earth rotated 1° while your shot was in the air. Your shot would be off by 1° because <strong>both you and the target are revolving around one another</strong>. This is the coriolis effect.</p><p></p><p>I guess a classic example would be shooting at the moon. You would have to aim where the moon WILL be in the amount of time it takes the bullet to get there.</p><p></p><p>If you change latitude and/or shooting direction, your zero can change.</p><p></p><p>I hope that is clear enough.</p></blockquote><p></p>
[QUOTE="isaaccarlson, post: 506774, member: 33850"] Gravity changes, yes. We have all heard of the Coriolis Effect. The earth is spinning at about 1,000 miles per hour at the equator. That is fast. If you shoot north or south at the equator, you should have almost no Coriolis Effect as the target and you are moving at or near the same speed and the target is not rising or dropping in relation to you. Hold on I am getting there.... If you shoot east, your bullet should hit high since the earth rotates to the east and the target is dropping in relation to you. If you shoot west, your bullet should hit low. Get it? You are standing on a ball that is spinning. When the bullet leaves the gun, it will continue to travel toward the original target location. The earth does not stop spinning when we shoot, so the angular relationship between you and the target is ALWAYS changing. Lets say, just for an example, that the earth rotated 1° while your shot was in the air. Your shot would be off by 1° because [B]both you and the target are revolving around one another[/B]. This is the coriolis effect. I guess a classic example would be shooting at the moon. You would have to aim where the moon WILL be in the amount of time it takes the bullet to get there. If you change latitude and/or shooting direction, your zero can change. I hope that is clear enough. [/QUOTE]
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Zero shift on travel to new location.
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