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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Question on Applied Ballistics App and Coriolis
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<blockquote data-quote="Jordan Smith" data-source="post: 1187993" data-attributes="member: 44423"><p>I was just about to weigh in with this exact "north pole" explanation, but I saw that you had already done so. Great post.</p><p></p><p>To add to this description just a little bit- I believe one reason for this effect, is that the shooter/bullet trajectory is perpendicular to the surface of the earth (parallel to the axis of gravity), regardless of geographical location, and the only place on earth that this perpendicular axis is completely parallel to the rotation axis of the earth, is shooting in an east/west direction, right at the equator. Here's a quick sketch that was drawn by my kid in grade 1 (cough), illustrating this point. At the equator when shooting E-W, there is no horizontal component of the earth's motion, relative to the trajectory of the bullet. When shooting the same direction further north, the axis' are no longer completely parallel, introducing a horizontal component to the earth's rotational motion, relative to the axis of the bullet trajectory (parallel to gravity's axis).</p><p></p><p>The circle is the earth, the black lines intersecting the earth's axis' represent the axis of the poles, and the equator. The red triangle and circle are the shooter's position, and the red arcs are the bullet's trajectory at two different geographical locations. I made the northern trajectory's E-W shooting direction exaggerated to more easily illustrate the point. The black line intersecting the northern shooter and the center of the earth is the axis of gravity.</p><p></p><p><img src="http://i1272.photobucket.com/albums/y397/The_Jerbel/Ballistics/Horizontal%20component%20of%20Coriolis%20Effect%20-%20crude%20sketch_zps4lh23ue1.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="Jordan Smith, post: 1187993, member: 44423"] I was just about to weigh in with this exact "north pole" explanation, but I saw that you had already done so. Great post. To add to this description just a little bit- I believe one reason for this effect, is that the shooter/bullet trajectory is perpendicular to the surface of the earth (parallel to the axis of gravity), regardless of geographical location, and the only place on earth that this perpendicular axis is completely parallel to the rotation axis of the earth, is shooting in an east/west direction, right at the equator. Here's a quick sketch that was drawn by my kid in grade 1 (cough), illustrating this point. At the equator when shooting E-W, there is no horizontal component of the earth's motion, relative to the trajectory of the bullet. When shooting the same direction further north, the axis' are no longer completely parallel, introducing a horizontal component to the earth's rotational motion, relative to the axis of the bullet trajectory (parallel to gravity's axis). The circle is the earth, the black lines intersecting the earth's axis' represent the axis of the poles, and the equator. The red triangle and circle are the shooter's position, and the red arcs are the bullet's trajectory at two different geographical locations. I made the northern trajectory's E-W shooting direction exaggerated to more easily illustrate the point. The black line intersecting the northern shooter and the center of the earth is the axis of gravity. [IMG]http://i1272.photobucket.com/albums/y397/The_Jerbel/Ballistics/Horizontal%20component%20of%20Coriolis%20Effect%20-%20crude%20sketch_zps4lh23ue1.png[/IMG] [/QUOTE]
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Question on Applied Ballistics App and Coriolis
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