The “Field Artillery Manual Cannon Gunnery” (TC 3-09.81) is a manual from the US Army explaining the operation of field artillery. From the manual, we know the operators of field artillery are required to account for Earth’s rotation.
Flat-Earthers wrongly claim that an artillery operator never needs to account for Earth’s rotation. In reality, from this operational manual, we know their claim is incorrect.
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The Coriolis force is a force that acts on objects that are in motion within a rotating frame of reference. Because the Earth is a rotating sphere, an object traveling unattached to Earth’s surface is affected by the Coriolis force, depending on its speed and direction, as well as its latitude on Earth’s surface.
The rotating motion of the Earth causes the different parts of Earth’s surface to have different linear speeds, depending on its distance from the Earth’s rotational axis. An object moving from a location to another with a different linear speed will be affected by the Coriolis force because the motion of the object is now being observed from another location with a different linear speed/direction relative to Earth’s rotational axis.
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