Meridian vs. Longitude: Know the Difference
By Shumaila Saeed || Updated on December 25, 2023
A meridian is an imaginary line running from the North to the South Pole, while longitude is the geographic coordinate measuring east-west positions on Earth's surface.
Key Differences
Meridians are imaginary lines that connect the North and South Poles, important for timekeeping and navigation. Longitude, on the other hand, is a measurement in degrees, marking how far east or west a location is from the Prime Meridian.
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Nov 30, 2023
The Prime Meridian is a specific meridian, set at 0 degrees longitude, from which all other longitudes are measured. It runs through Greenwich, England, serving as a global reference point.
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While every meridian is of equal significance in dividing the Earth into eastern and western hemispheres, longitude values are crucial for precise positioning, with each degree, minute, and second indicating a specific location.
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A meridian, especially the Prime Meridian, plays a key role in timekeeping, as time zones are defined based on its position. Longitudes, meanwhile, help in calculating local time differences around the world.
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Meridians assist in global navigation by providing a fixed reference, whereas longitude coordinates are essential for creating accurate maps and guiding navigation systems to pinpoint locations.
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Comparison Chart
Definition
Imaginary line connecting North and South Poles.
Geographic coordinate measuring east-west position.
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Significance
Used as references for time zones and navigation.
Determines a location's east or west distance from the Prime Meridian.
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Measurement Units
Represented as specific lines, not in degrees.
Measured in degrees, minutes, and seconds.
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Global Role
Integral in global timekeeping.
Essential for precise global positioning.
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Prime Meridian
The Prime Meridian is the zero degree of longitude.
All longitudes are measured relative to the Prime Meridian.
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Meridian and Longitude Definitions
Meridian
A reference for navigators.
Sailors used the meridian to guide their journey.
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Longitude
Denotes east or west distance.
His journey covered 30 degrees in longitude.
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Meridian
Basis for longitude lines.
Each meridian is a line of constant longitude.
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Longitude
Key in global navigation.
Longitude coordinates helped them find their exact location.
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Meridian
An imaginary great circle on the earth's surface passing through the North and South geographic poles.
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Longitude
Essential in mapmaking.
Maps include longitude lines for precise positioning.
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Meridian
Either half of such a great circle from pole to pole. All points on the same meridian have the same longitude.
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Longitude
Measures east-west position.
The longitude of New York City is approximately 74 degrees west.
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Meridian
(Astronomy)A great circle passing through the two poles of the celestial sphere and the zenith of a given observer.Also called celestial meridian, local meridian, vertical circle.
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Longitude
Influences local time.
Time changes by one hour for every 15 degrees of longitude.
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Meridian
A curve on a surface of revolution, formed by the intersection of the surface with a plane containing the axis of revolution.
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Longitude
Angular distance on the earth's surface, measured east or west from the Prime Meridian at Greenwich, England, to the meridian passing through a position, expressed in degrees (or hours), minutes, and seconds.
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Meridian
A plane section of a surface of revolution containing the axis of revolution.
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Meridian
Any of the longitudinal lines or pathways on the body along which the acupuncture points are distributed.
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Longitude
(geography) Angular distance measured west or east of the prime meridian.
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Meridian
The highest point in the sky reached by the sun or another celestial body; a zenith.
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Longitude
Any imaginary line perpendicular to the equator and part of a great circle passing through the North Pole and South Pole.
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Meridian
The time at which the sun reaches its highest point in the sky; noon.
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Meridian
The highest point or stage of development; peak:"Men come to their meridian at various periods of their lives"(John Henry Newman).
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Longitude
Length; measure or distance along the longest line; - distinguished from breadth or thickness; as, the longitude of a room; rare now, except in a humorous sense.
The longitude of their cloaks.
Mine [shadow] spindling into longitude immense.
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Longitude
The arc or portion of the equator intersected between the meridian of a given place and the meridian of some other place from which longitude is reckoned, as from Greenwich, England, or sometimes from the capital of a country, as from Washington or Paris. The longitude of a place is expressed either in degrees or in time; as, that of New York is 74° or 4 h. 56 min. west of Greenwich.
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Longitude
The distance in degrees, reckoned from the vernal equinox, on the ecliptic, to a circle at right angles to the ecliptic passing through the heavenly body whose longitude is designated; as, the longitude of Capella is 79°.
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Longitude
An imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator;
All points on the same meridian have the same longitude
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Meridian
Of, relating to, or constituting the highest point, as of development or power:the empire in its meridian period.
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Meridian
In full celestial meridian: a great circle passing through the poles of the celestial sphere and the zenith for a particular point on the Earth's surface.
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Meridian
In full terrestrial meridian: a great circle on the Earth's surface, passing through the geographic poles (the terrestrial North Pole and South Pole); also, half of such a circle extending from pole to pole, all points of which have the same longitude.
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Meridian
The place on the celestial meridian where it is crossed by the sun or a star at its highest point.
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Meridian
A ring or half-ring with markings in which an artificial globe is installed and may spin.
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Meridian
(mathematics) A line passing through the poles of any sphere; a notional line on the surface of a curved or round body (in particular, an eyeball).
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Meridian
The size of type between double great primer and canon, standardized as 44-point.
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Meridian
A particular area or situation considered as having a specific characteristic or identity; also, the characteristics, habits, or tastes of a specific group, locale, etc.
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Meridian
Any of the pathways on the body along which chi or qi (life force) is thought to flow and, therefore, the acupoints are distributed; especially, one of twelve such pathways associated with organs of the body.
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Meridian
(transitive) To cause an object to reach the meridian or highest point of (something).
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Meridian
Being at, or pertaining to, midday; belonging to, or passing through, the highest point attained by the sun in his diurnal course.
Tables . . . to find the altitude meridian.
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Meridian
Pertaining to the highest point or culmination; as, meridian splendor.
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Meridian
Hence: The highest point, as of success, prosperity, or the like; culmination.
I have touched the highest point of all my greatness,And from that full meridian of my gloryI haste now to my setting.
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Meridian
A great circle of the sphere passing through the poles of the heavens and the zenith of a given place. It is crossed by the sun at midday.
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Meridian
A great circle on the surface of the earth, passing through the poles and any given place; also, the half of such a circle included between the poles.
All other knowledge merely serves the concerns of this life, and is fitted to the meridian thereof.
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Meridian
An imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator;
All points on the same meridian have the same longitude
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Meridian
A line from North to South Pole.
The meridian passing through Greenwich is used as a reference for time zones.
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Meridian
Basis for dividing Earth into time zones.
Time zones are defined with respect to a meridian.
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Meridian
Used in celestial navigation.
Astronomers observe stars crossing the meridian for accurate positioning.
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Repeatedly Asked Queries
Can longitude be negative?
Yes, west of the Prime Meridian longitudes are negative.
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How many meridians are there?
Infinite, as any semicircle connecting the poles is a meridian.
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What is longitude?
A geographic coordinate that measures east-west position on Earth.
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What is the Prime Meridian?
The meridian designated at 0 degrees longitude in Greenwich, England.
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What is a meridian?
An imaginary line connecting the North and South Poles.
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Why are meridians important in navigation?
They provide fixed north-south reference lines for navigators.
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Are meridians straight lines on a globe?
Yes, they run in a true north-south direction.
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What happens at 0 degrees longitude?
It's the location of the Prime Meridian, the world's time standard.
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How is longitude measured?
In degrees, minutes, and seconds east or west of the Prime Meridian.
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Do longitudes affect time zones?
Yes, time zones are generally based on longitudinal divisions.
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Is the Prime Meridian constant?
Yes, its position is fixed for international standardization.
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How does longitude affect climate?
It influences the solar time and, indirectly, the local climate.
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How does longitude help in GPS?
It provides precise east-west positioning in coordination systems.
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What is the International Date Line?
A meridian at 180 degrees longitude, marking a day change.
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How does the Prime Meridian affect timekeeping?
It's the starting point for time zones and Greenwich Mean Time (GMT).
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What's the difference between meridians and parallels?
Meridians run north-south, while parallels (latitudes) run east-west.
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Is the Prime Meridian the only important meridian?
While it's the most significant for global standards, other meridians are also important for local references.
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Can meridians be used for celestial navigation?
Yes, celestial objects' positions are often measured relative to meridians.
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Do meridians intersect with latitudes?
Yes, they intersect perpendicularly with latitude lines.
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About Author
Written by
Shumaila SaeedShumaila Saeed, an expert content creator with 6 years of experience, specializes in distilling complex topics into easily digestible comparisons, shining a light on the nuances that both inform and educate readers with clarity and accuracy.
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