ScienceSeptember 4, 2026
geoid
JEE-oyd
Definition
The hypothetical shape Earth's surface would take if it were defined entirely by the average level of gravity, ignoring features like mountains or ocean currents.
Etymology
The term was coined in the 19th century by mathematician Johann Benedict Listing, combining the Greek prefix geo- (Earth) and -oid (resembling or in the shape of).
In the news
The article uses the geoid as a reference surface to map how uneven mass distribution creates subtle variations in Earth's gravitational pull. Understanding this model is critical for satellites to calculate accurate sea levels and ground elevations.
Why the viral "potato-shaped" Earth image reveals a hidden planetary reality
Read the full article ↗Futura, le média qui explore le monde