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Message: <blockquote data-quote="WaterRabbit" data-source="post: 1607999" data-attributes="member: 2445">Assuming you are not being sarcastic, look in the SRD Wilderness and Environment > Winds for their effect on ranged attacks.  Strong winds impose a -2 penalty to ranged attack rolls, severe winds impose a -4 penalty, and ranged attacks are impossible at wind speeds of 50 mph or more.Relative motion is not taken into account in the d20 system regardless of the target's movement mode.  The only benefit for movement is if the target is "running".  The target cannot apply its dexterity bonus to its AC but gets a +2 bonus instead.  However, if you are really interested, GURPs has a chart that you can use for this.  Translation to d20 will be the difficult part.  <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f609.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=";)" title="Wink    ;)"  data-smilie="2"data-shortname=";)" /> The rotation of the earth is generally not an issue in projectile motion calculations unless you are firing self-propelled projectiles at very long ranges (i.e. missiles).Now, I am a little rusty here, but I think my math is correct.  We first calculate when the speed of the project will reach zero.  Which occurs 6.25 seconds after leaving the bow (assuming an initial velocity of 200 fps).  We then plug that value into the one-dimensional distance equation, which gives us 625 feet.However, you can go to this website <a href="http://www.huntingsociety.org/ArrowInfo.html" target="_blank">http://www.huntingsociety.org/ArrowInfo.html</a> and see the experiments they did with arrows traveling at 150 fps.</blockquote>

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