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A comment on My grandfather was almost shot down by ground to air missiles at the Whitehouse (2018). Parent comment

Re:My grandfather was almost shot down by ground to air miss... by mike_d on Wednesday January 18, 2023 @01:19AM (#34423945)
> The runways may have changed numbers (I’m not sure how to confirm this)

Runways and named by taking the degrees from magnetic north and dropping the last digit. Parallel runways will be designated (for example) 31L(eft) 31C(enter) 31R(right).

You'd need to rotate the runway to rename it.

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Re:My grandfather was almost shot down by ground to air miss... by margalabargala on Wednesday January 18, 2023 @01:32AM (#34423990)
That's one option. The other one is to move magnetic north.

This story is from the early 80s. The magnetic north pole moves around 40 miles per year. What was once runway 18 at DCA over 40 years ago is now 19.

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