Latitude and Longitude

Summary

Latitude measures angular distance north or south of the Equator; longitude measures angular distance east or west of the Prime Meridian.

Core concept

Understand the system

Latitude measures angular distance north or south of the Equator; longitude measures angular distance east or west of the Prime Meridian.

Why / how it happens

Causes and context

A spherical Earth requires angular coordinates to identify position consistently. Latitude is tied to the Equator and the changing angle of solar incidence, while longitude is tied to Earth's rotation and therefore provides the basis for local-time differences.

Mechanism / process

First, latitude is measured north or south from the Equator along a meridian. Next, longitude is measured east or west from the Prime Meridian along an arc. Their intersection gives a coordinate, while the longitude difference is converted into local-time difference as Earth rotates.

Key facts

• Equator is 0° latitude; poles are 90°N and 90°S.
• Prime Meridian is 0° longitude and passes through Greenwich.
• One degree of longitude equals four minutes of time in local-time calculation.

Important terminology

• parallel
• meridian
• Equator
• Prime Meridian
• geographic coordinates

Established figures

• Equator is 0° latitude; poles are 90°N and 90°S.
• Prime Meridian is 0° longitude and passes through Greenwich.

Named examples / case studies

• A coordinate such as 23.8°N, 90.4°E locates Dhaka approximately.

Causes / components

• A spherical Earth requires angular rather than only linear location measures.
• The Equator provides the reference for latitude.
• The Prime Meridian provides the reference for longitude.

Effects / significance

• Coordinates allow mapping, navigation, surveying and GIS location.
• Latitude helps explain insolation and climate zones; longitude underpins time calculation.
• Meridians converge, so the length of one degree of longitude decreases toward the poles.

Geography connection

A coordinate such as 23.8°N, 90.4°E locates Dhaka approximately. This illustrates how latitude and longitude varies by location, scale or environmental context.

Bangladesh connection

Bangladesh lies approximately between 20°34′N–26°38′N and 88°01′E–92°41′E.

BCS preliminary facts

• Equator is 0° latitude; poles are 90°N and 90°S.
• Prime Meridian is 0° longitude and passes through Greenwich.
• One degree of longitude equals four minutes of time in local-time calculation.

BCS written analysis

Build an analytical answer

• Distinguish latitude as a north-south angular measure from longitude as an east-west angular measure.
• Explain why latitude has climatic significance while longitude has a direct time-zone relationship.
• Apply the coordinate system to Bangladesh's location and standard meridian.

Common misconceptions

• Latitude lines do not converge; meridians do.
• Longitude determines time difference, not latitude.

Quick revision

• Latitude and Longitude
• Equator is 0° latitude; poles are 90°N and 90°S.
• Prime Meridian is 0° longitude and passes through Greenwich.
• parallel / meridian
• Definition → process → spatial example