<p><img src="https://imgs.xkcd.com/comics/lightning_distance.png" alt="The index of radio refraction does have a lot of variation, which might throw off your calculations, so you can also look at the difference in brightness between the visible flash and more-attenuated UV and x-rays."></p>
<blockquote>
<p>"<a href="https://xkcd.com/2027/">Lightning Distance</a>", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License</p>
</blockquote>
<h2 id="alt-text"><a aria-hidden="true" class="anchor-heading" href="#alt-text"><svg aria-hidden="true" viewBox="0 0 16 16"><use xlink:href="#svg-link"></use></svg></a>Alt Text</h2>
<p>The index of radio refraction does have a lot of variation, which might throw off your calculations, so you can also look at the difference in brightness between the visible flash and more-attenuated UV and x-rays.</p>

xkcd

Lightning Distance


# XKCD

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