If your kid can achieve absolute pitch in geometric space, like.. epsg:4978? That would be epic. Your kid could always tell you what coordinates you're at if you're standing at a known angle.

What does "epsg:4978" mean?

A longer name for WGS 84.

Sort of but not exactly. The way I'd explain it as someone who's had to deal with a lot but has not been formally trained in it is that WGS 84 is a system for reasoning about the earth spatially. EPSG:4978 and its more commonly used sister EPSG:4326 are standardized ways of writing down coordinates relative to the WGS84 model of the earth.

The "joke" in my comment is that EPSG:4978 coordinates are written down in distance in meters from the center of the earth, as a sort of absolute position that's nice to use in maths. In contrast to EPSG:4326 where coordinates are written down (usually in degrees) relative to the equator and a line through some place in England over an idealized representation of the surface of the earth.

Wrong kind of pitch. Read the article.

I think you may have missed a little humor being committed

Maybe your missed the tone of their comment?

Whoosh.