You were told as a child the earth is a ball and from that moment on just like your parents before you you never questioned it, If no one told you the earth spins would you assume it does? Water does not conform to the exterior of any object! No matter how high you go the horizon always meets you at eye level. If the earth has a wobble of 23 degrees why is polaris always in the same place in the sky? Objects that leave your visual horizon can be brought back into view with a telescope-binoculars or even a high powered camera. Stars are perfectly mapped using an astrolab or sextant any time of the year.