evidence: Claims the Earth is flat continue to circulate, though. [...] Claim: The Earth is flat because cities cannot be upside-down [...] The Earth is not flat, it's spherical, as proven by photos from space and an array of observations and calculations that can be done from Earth. Planetary scientists say the visibility of the moon and sun during the daytime, doesn't prove a flat Earth – it is in fact proof of the motion of the sun, moon and Earth in space, along with the Earth's rotation. Read more.