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Approximately how long is the daytime (the time between sunrise and sunset) on the 21st21^\text{st}21st of December in Paris?
Note: Paris is on the latitude ϕ=49∘.\phi = 49^\circ.ϕ=49∘. The Earth is tilted at an angle of ψ=23.4∘\psi = 23.4^\circψ=23.4∘ relative to its axis of rotation.
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