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If you stand at Earth's north pole, Polaris is directly above you. If you stand at the equator, Polaris is on the horizon. If you are at a location between the north pole and the equator, Polaris occupies an intermediate position above the horizon. In other words, Polaris is a useful marker to help you determine where north is, and at what latitude you are located. Your latitudinal position is equal to the elevation above the horizon. At the north pole (90 degrees latitude ) Polaris is overhead at an altitude of 90 degrees. At the equator (zero degrees latitude) Polaris is at an altitude of zero degrees. The same is true for any location on Earth. For example, Cleveland, Ohio, is at a latitude of about 42 degrees north of the equator; Polaris can be observed at an altitude 42 degrees above the horizon.
originally posted by: DenyObfuscation
a reply to: awareness10
For an observer at the north pole Polaris is overhead. Straight up. Observers at the equator have a horizontal/level line of sight to Polaris. That means they would be looking towards the observer at the north pole and Polaris simultaneously if the Earth were flat. How could that be?
originally posted by: DenyObfuscation
a reply to: EvillerBob
An illusion? Like day and night? Fascinating. Do go on, explain.
originally posted by: Phage
a reply to: Chadwickus
Yeah.
But it's true that you can fool stupid people all of the time. Harder to fool people that look at the sky at night.
I'd like to point out, though, that if Polaris is only 175km above the middle of the planet, then from the edge it would appear to be almost touching the ground while from the middle you would see it directly above you. Atmospheric variation and distortion accounts for why it appears to be a 45 degree angle at the so-called 45th, when it's actually only 3.2 degrees.
originally posted by: DenyObfuscation
a reply to: EvillerBob
I'd like to point out, though, that if Polaris is only 175km above the middle of the planet, then from the edge it would appear to be almost touching the ground while from the middle you would see it directly above you. Atmospheric variation and distortion accounts for why it appears to be a 45 degree angle at the so-called 45th, when it's actually only 3.2 degrees.
Sweet. We'll pretend for a moment your idea is plausible. Why is Polaris not visible to the southern hemisphere?
originally posted by: DenyObfuscation
a reply to: EvillerBob
I like your idea about refraction causing Polaris to only appear to correspond to one's latitude.