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as the stars get closer to the horizon

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they seem to slow down a little bit

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because of the atmospheric refraction

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this is actually occurring in this video

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bye-bye back at broschi it's a little

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hard to see what I did is I waited into

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some very distinctive styles appeared

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these two stars right here and I took

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this section of the image and I took it

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into Photoshop increase the contrast and

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then place the line every one second

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where the leading star was so here's the

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full clip I've added a timecode so you

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can see that the star does in fact

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coincide with the line at the exact one

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second mark

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and here it is again at one-quarter

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speed if you look carefully at the

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leading star of the two stones when it

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hits a red dot or green line it can be

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exactly the same as the second mark on

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the timecode

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so here it is coming up on the five

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second so no five six so it's showing

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that these lines are spaced exactly one

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second apart and as you can see they get

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significantly closer together as you get

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closer to the horizon so what would this

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look like if it was a actually going at

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a constant speed well let's have some

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blue dots showing what would happend

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parrying the actual positions in the red

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dots with the extrapolated positions in

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the blue dots you can see how far behind

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the star is lagging behind its actual

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geometric position the blue dot here's a

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close-up of the final situation showing