How as an individual can I know if the Earth is a sphere or a flat disc? What experiment can I do that doesn't involve trusting information from a 3rd party that would prove what the geometry really is?
in my childhood days I know about the earth is definitely flat but in my school days they will be said and teaching like the earth will be like Sphere in shape so the confusion will be going on my mind from a long period of time to make the clear thought