Ummm, that I can look at the sky and know for a 100% fact that it's round from simple observations tells me know. It sounds like you are parroting what YouTubers say instead of actually gaining intelligence on how we have known with 100% certainty the earth is a globe for almost 2000 years now. And we have known with 100% certainty it's heliocentric since the invention of the telescope and the simple observation and measurement of stellar parallax.