Skyscraper height to be seen from anywhere on earth?

How tall would a Skyscraper have to be to be seen from anywhere on the planet Earth? If somebody built a skyscrapaer on lets say Asia, how tall would it have to be in order to be seen with out binoculars or a telescope from California? How tall would the tower have to be to be seen with the naked eye on the other side of the world? Any suggestions? Thank You.

Answer #1

Flat earther?

Answer #2

If it was exactly on the opposite side of the world it wouldnt matter how tall it was; it couldnt be seen because the earth is round and the circumferential horizon would block its view.

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