Trigonometry is used in surveying to determine the distance between two points, often using the principles of triangulation.

Trigonometry is used in navigation to determine the direction of a ship's movement, often using the principles of dead reckoning.

Trigonometry is used in engineering to calculate the forces acting on a structure, such as a bridge or a building, to ensure its stability.

Trigonometry is used in astronomy to calculate the distance to a star, often using the principles of parallax.

In surveying, the angle between the horizontal and the line of sight to an object is called the angle of elevation.

In navigation, the angle between the true north and the direction of a ship's movement is called the bearing.

In engineering, the angle between two intersecting lines or planes is called the angle of intersection.

In astronomy, the angle between the ecliptic and the celestial equator is called the obliquity of the ecliptic.

In surveying, the horizontal distance between two points is simply called the horizontal distance.

In navigation, the vertical distance between two points is simply called the vertical distance.

In engineering, the angle between a force and the horizontal is called the angle of attack.

In astronomy, the angle between the axis of rotation of a planet and the normal to its orbital plane is called the axial tilt.

In surveying, the instrument used to measure angles is called a theodolite.

In navigation, the instrument used to measure the angle of elevation or depression of a celestial body is called a sextant.

In engineering, the instrument used to measure the angle between two surfaces is called a bevel gauge.