Winter solstice

Geometry Level 2

Approximately how long is the daytime (the time between sunrise and sunset) on the 21st21^\text{st} of December in Paris?

Note: Paris is on the latitude ϕ=49.\phi = 49^\circ. The Earth is tilted at an angle of ψ=23.4\psi = 23.4^\circ relative to its axis of rotation.

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