Main article: Horizon § Distance to the horizon Graphs of distances to the true horizon on Earth for a given height h. Visibility of distant objects on Earth's surface These include the visibility of distant objects on Earth's surface lunar eclipses appearance of the moon observation of the sky from altitude observation of certain, fixed stars from different locations observing the Sun surface navigation grid distortion on a spherical surface weather systems gravity and modern technology. The spherical shape causes a number of effects and phenomena that combined disprove flat Earth beliefs. The roughly spherical shape of Earth can be empirically evidenced by many different types of observation, ranging from ground level, flight, or orbit.
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