Good question, I'm glad you asked. Below i linked you a Playlist of videos that address that exact topic. Please check it out as the visual aid makes it far more comprehensible. But to state it in my own words, if I were to watch a vessel sail off into the horizon until it vanishes, due to the limits of our vision it will vanish as if it's melting into the horizon. However with the semi recent invention of cameras with high zoom capability while recording, these objects can be brought back into full view after apparently vanishing over the horizon. Earth curve playlist: https://youtube.com/playlist?list=PLyHwsN1Rg4IrRn4efSuyOl4AkEmcvrCMo

Here is a good example the media tried to explain away with an atmospheric phenomina known as refraction. Temperature differences over land or water can actually bend light allowing you to see things you shouldn't. However the image it produces should be scattered, warped, and disproportionate; maybe even inverted like some mirages. And refraction had a very limited effect. This is a case of downtown Chicago being viewed from 60 miles away across lake Michigan. The tallest building in Chicago is 1451 ft plus a little more over the lake. The observer, depending on their height of eye which is obviously close to the lake, should have had Chicago obscured by hundreds of feet of earth curve, even the tallest building. https://youtu.be/SADAiC6DNFg

Verify my claims by simply googling an earth curve calculator online, though I can do these calculations on my own.

Please let me know if you want me to go into more detail for the math behind any of my claims, and appreciate your inquisitiveness.