the globe el globo (terráqueo): She always wanted to travel the globe. ^ They've visited lots of cities across the globe.

the circumference /səˈkʌmfərəns/ of the Earth la circunferencia de la Tierra: Eratosthenes, a Greek mathematician, was the first person to calculate the circumference of the Earth.

the curvature /ˈkɜːvəʧə/ of the Earth's surface la curvatura de la superficie terrestre: As you go up into the atmosphere, you will start to see the curvature of the Earth's surface.

circumnavigate the world/the Earth (formal) circunnavegar el mundo/la tierra: Who was the first person to circumnavigate the world?

circumnavigation circunnavegación: Juan Sebastián Elcano was the navigator whose expedition completed the first circumnavigation of the Earth, in 1522.

circumnavigator circunnavegador,-ra