perplexus.info :: Science : Tropic Monuments

Tropic Monuments (Posted on 2023-07-10)

Ecuador has a monument on the equator, and Greenwich, UK has a line on the ground representing the prime meridian. Suppose a country on the arctic circle or the tropic of cancer proposes a monument on their respective significant latitude lines. How feasible is it?

If the tilt of the earth's axis (obliquity of the ecliptic) is changing at about 47 arc seconds per century, how far would the monuments have to move each year?

Submitted by Charlie

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Solution: (Hide)

Ballpark figures:
Consider the earth to be 4000 miles in radius. That comes out to 102 feet per arc second of latitude. That gives about 4700 feet per century or 47 feet per year.

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