APPARENT HORIZON: Where the sky appears to meet the Earth. (Also sea horizon.) Because of perspective effects, different observers generally have different apparent horizons. Because of refraction, even the sea horizon usually lies above the geometric horizon. -From the Atmospheric Optics Glossary. Knowing the distance to the horizon is handy when estimating how long it [...]
How Far Away is the Horizon
APPARENT HORIZON: Where the sky appears to meet the Earth. (Also sea horizon.) Because of perspective effects, different observers generally have different apparent horizons. Because of refraction, even the sea horizon usually lies above the geometric horizon. -From the Atmospheric Optics Glossary. Knowing the distance to the horizon is handy when estimating how long it [...]