nadir

i. ayak ucu [ast.], en aşağı nokta

As the blackness of the night recedes so does the nadir of yesterday. The child I am forgets so quickly.
Sylvia Ashton-Warner

As the blackness of the night recedes so does the nadir of yesterday. The child I am forgets so quickly.
Sylvia Ashton-Warner

Since the concept of being below is itself somewhat vague, scientists define the nadir in more rigorous terms.

Specifically, in astronomy, geophysics and related sciences (e.g., meteorology), the nadir at a given point is the local vertical direction pointing in the direction of the force of gravity at that location.

The direction opposite of the nadir is the zenith.

The nadir (from Arabic) is the direction pointing directly below a particular location; that is, it is one of two vertical directions at the location, orthogonal to a horizontal flat surface there.

The term nadir can also be used to represent the lowest point reached by a celestial body during its apparent orbit around a given point of observation.

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