Answer:
There are four observations that helped Aristotle to understand that Earth is round.
Step-by-step explanation:
- The Ships he observed appeared from to sail first behind the horizon, after then only the hull.
- We can see further standing on a higher standpoint. The ships again but also islands in the Aegean sea from a cliff.
- The Earth 's shadow caused the eclipse (lunar). He also observed that the shadow always looked circular.
- While travelling to south new constellations can be seen above the southern horizon. And as we travel more towards the south we see Polaris lower and lower.