Stonehenge Zero

If you were an advanced civilization who discovered your planet was about to be reset to stone-age significance;

how would you convey to the survivors your worlds greatest achievements of extreme knowledge regarding math, geometry, astronomy, mapping the planet, etc...?

Would you create a megalithic monument in the shape of a 0 (zero) near 0 degrees true North ..?

https://imgur.com/FqOIxT4