And it turned out to be a that little path next to the Royal Observatory in Greenwich, not the Prime Meridian line. The 0° meridian is what the GPS uses for global navigation, the discrepancy results from the fact that the Prime Meridian was originally measured without taking it into consideration that the Earth isn’t a perfect smooth ball (if the measurements are made inside the UK, as it it was originally done, this does’t lead to as much discrepancy as when vaster areas are included).
While Mom and sis were away on a ballet weekend to Amsterdam Simon and Dad reviewed some topography. Topography is one of the things Simon used to be completely obsessed with. When he was 5, he spent hours drawing political maps of whole continents and regions from memory. For example, he would sit down and draw the map of the Caribbean, the tiniest islands included. When he drew a map of Latin America on his Christmas card at school that year his teacher didn’t hang the card on the wall, together with everyone else’s cards, because Simon’s card “wasn’t about Christmas”.
We were wondering how much Simon remembered now, without having practiced any topography this year. Turned out he’s still standing strong:
And here is Simon when he was 5: