As nouns the difference between horizontal and dygogram

is that horizontal is a horizontal component of a structure while dygogram is (nautical) a chart showing the horizontal variation in the magnetic force acting on a ship's compass needle by the iron within the ship, as a function of course steered.

As an adjective horizontal

is perpendicular to the vertical; parallel to the plane of the horizon; level, flat.

In nautical terms the difference between variation and dygogram

is that variation is the angular difference at the vessel between the direction of true north and magnetic north. Also called magnetic declination while dygogram is a chart showing the horizontal variation in the magnetic force acting on a ship's compass needle by the iron within the ship, as a function of course steered.

As nouns the difference between variation and dygogram

is that variation is the act of varying; a partial change in the form, position, state, or qualities of a thing while dygogram is a chart showing the horizontal variation in the magnetic force acting on a ship's compass needle by the iron within the ship, as a function of course steered.

As an adjective magnetic

is magnetic.

As a noun dygogram is

(nautical) a chart showing the horizontal variation in the magnetic force acting on a ship's compass needle by the iron within the ship, as a function of course steered.

As nouns the difference between iron and dygogram

is that iron is pencil while dygogram is (nautical) a chart showing the horizontal variation in the magnetic force acting on a ship's compass needle by the iron within the ship, as a function of course steered.

As a verb course

is .

As a noun dygogram is

(nautical) a chart showing the horizontal variation in the magnetic force acting on a ship's compass needle by the iron within the ship, as a function of course steered.

As a verb doubling

is .

As a noun duplation is

doubling.

As nouns the difference between multiplication and duplation

is that multiplication is (uncountable|mathematics) the process of computing the sum of a number with itself a specified number of times, or any other analogous binary operation that combines other mathematical objects