Is there a calculator online that will tell me how much the target "moves" with the Earth's rotation at given distances and time? I'm trying to figure out how much a 6.5CM is affected by planet rotation at 1,000 yards. I know it isn't much, but I was looking for precise numbers.
Is there a calculator for earth rotation?
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knastera
Just another shooter
The name of what you are looking for is the Coriolis Effect. Here is a calculator: https://www.omnicalculator.com/physics/coriolis-effect
Most quality ballistics calculators will compensate for this, BTW.
Yeah, I'm actually looking to settle an argument, so I need specifics.
I guess I'll have to figure out how many pounds a 140 grain bullet weighs. Thanks!
The argument with the wife has stepped up a notch....would've been easier to say "yes dear"
biermkr
Ultimate Member
This doesn't look like what I am looking for actually. This is a coriolis effect calculator, but that is more of a spin calculator. I'm looking for straight distance and elevation
.02 lbs
One pound is 7000 grains.
So according to the calculator and plugging in some basic numbers, the Coriolis effect is .2706 ft/s(2), and with a basic velocity of 2004 mph. The bullet is traveling roughly 2,940 fps, so at a thousand yards it's going to travel for just a smidge over 1 second. (1.02 seconds, actually)
So given that information, the Coriolis effect is going to move the bullet a grand total of about 3 inches to the right (3.24, actually) provided you are facing North or South.
Those were the calculations I came up with, but it appears to be supported by this article:
https://www.thetruthaboutguns.com/c...rs-extreme-long-range-shooting-for-beginners/
So given that information, the Coriolis effect is going to move the bullet a grand total of about 3 inches to the right (3.24, actually) provided you are facing North or South.
Those were the calculations I came up with, but it appears to be supported by this article:
https://www.thetruthaboutguns.com/c...rs-extreme-long-range-shooting-for-beginners/
Fishguy
Ultimate Member
I thought that figure varied depending on your latitude?
It does. That is in the tool. I wonder about west to east shots though
Boats
Broken Member
it does. the figure he came up with is correct at the equator. the effect lessens as one moves away from the equator.
and
only when shooting due south.
when shooting due north the bullet would move to the left.
when shooting due east the bullet would move up
when shooting due west the bullet would move down.
I think
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budman93
Ultimate Member
I actually work for an online equation/calculator website. We are always looking for new stuff to add. I'll see if we can work up something for this.
IslandCrLeverGun
Member
This is my first post on the forum. Hope it isn’t regarded as overstepping. It’s just that I have some training and experience in dealing with Coriolis acceleration and thought this might help.
The Coriolis effect is dependent upon the latitude of your location, and the speed of the rotation of the earth at that latitude. In the northern hemisphere, an object moving in a straight line appears to deflect to the right. It does not matter if you are shooting north or south, in the northern hemisphere the shot will appear to move to the right (target moves to the left).
Here is a nice explanation I found on the National Geographic site.
“Let’s pretend you’re standing at the Equator and you want to throw a ball to your friend in the middle of North America. If you throw the ball in a straight line, it will appear to land to the right of your friend because he’s moving slower and has not caught up.
Now let’s pretend you’re standing at the North Pole. When you throw the ball to your friend, it will again to appear to land to the right of him. But this time, it’s because he’s moving faster than you are and has moved ahead of the ball.
Everywhere you play global-scale "catch" in the Northern Hemisphere, the ball will deflect to the right.”
Coriolis imposes the least influence at the low latitudes and the most influence at the higher latitudes - at low latitudes the relative surface speed of the earth rotation changes much less with latitudinal changes then is the case at high latitudes.
I just used an online general purpose Coriolis calculator (not a firearms-specific calculator) (https://www.omnicalculator.com/physics/coriolis-effect) and plugged in the numbers for a 13 g (200 gr) object traveling at 2,500 FPS at 39 degrees of latitude (about the Bay Bridge location) and it gave a Coriolis acceleration of .229 ft/ sec-sq, which if I’m recalling and using correctly what my high school physics nun tried to teach me (displacement = one half the acceleration multiplied by the square of the travel time) should result in about a 1.37 inch deflection (to the right) in the first second of travel if the shot is due north or south. I believe that displacement estimate should be reduced as the bearing of the shot moves away from north (or south), to near zero for due east or due west.
The Coriolis effect is dependent upon the latitude of your location, and the speed of the rotation of the earth at that latitude. In the northern hemisphere, an object moving in a straight line appears to deflect to the right. It does not matter if you are shooting north or south, in the northern hemisphere the shot will appear to move to the right (target moves to the left).
Here is a nice explanation I found on the National Geographic site.
“Let’s pretend you’re standing at the Equator and you want to throw a ball to your friend in the middle of North America. If you throw the ball in a straight line, it will appear to land to the right of your friend because he’s moving slower and has not caught up.
Now let’s pretend you’re standing at the North Pole. When you throw the ball to your friend, it will again to appear to land to the right of him. But this time, it’s because he’s moving faster than you are and has moved ahead of the ball.
Everywhere you play global-scale "catch" in the Northern Hemisphere, the ball will deflect to the right.”
Coriolis imposes the least influence at the low latitudes and the most influence at the higher latitudes - at low latitudes the relative surface speed of the earth rotation changes much less with latitudinal changes then is the case at high latitudes.
I just used an online general purpose Coriolis calculator (not a firearms-specific calculator) (https://www.omnicalculator.com/physics/coriolis-effect) and plugged in the numbers for a 13 g (200 gr) object traveling at 2,500 FPS at 39 degrees of latitude (about the Bay Bridge location) and it gave a Coriolis acceleration of .229 ft/ sec-sq, which if I’m recalling and using correctly what my high school physics nun tried to teach me (displacement = one half the acceleration multiplied by the square of the travel time) should result in about a 1.37 inch deflection (to the right) in the first second of travel if the shot is due north or south. I believe that displacement estimate should be reduced as the bearing of the shot moves away from north (or south), to near zero for due east or due west.
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Nicely explained. Thank you.
on_the_rox
Ultimate Member
Ok, that has to rank pretty high up in the realm of first posts......
Just saying.
Just saying.
Boats
Broken Member
Very informative and detailed post. You should go over to the new members page and say hello.
Dave if you happen to be in an argument with IslandLeverGun you should just pay him the $2 now and move on. You odds of winning are less than 3%.
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