Editing Eartha (section)

==Construction==
The globe was built with a scale of 1:1,000,000, on which one inch represents sixteen miles (1mm = 1km).<ref name="AO">{{cite web |title=Eartha |url=https://www.atlasobscura.com/places/eartha-delorme-headquarters |website=Atlas Obscura }}</ref><ref name="Sharp1998">{{cite news |first1=David |last1=Sharp |agency=Associated Press |date=24 July 1998 |title=EARTH STARTS TURNING IN YARMOUTH TWO YEARS IN THE MAKING, DELORME'S GIANT GLOBE - THE WORLD'S LARGEST - IS FINISHED |work=Portland Press Herald |id={{ProQuest|276844280}} }}</ref>  As with most globes, it is mounted at a 23.5 degree angle, the same axial tilt as the Earth itself; thus the [[equator]] is diagonal to the floor. It uses a [[cantilever]] mount with two motors, and simulates one day's revolution and rotation every 18 minutes, though it is possible for the motors to fully rotate the globe in as little as one minute.{{fact|date=July 2020}}
[[File:Eartha 2023.jpg|thumb|The truss structure of the globe made visible during a panel-replacement project in 2023]]
The globe was completed in 1998,<ref name="AO" /> after two years of construction and planning,<ref name="Sharp1998" /> and it uses a composite database built from [[satellite imagery]], [[shaded relief]], colored [[bathymetry]], and information about [[Highway|road networks]] and urban areas. The database used to generate the surface images was approximately 140 [[gigabyte]]s.{{fact|date=July 2020}}

Former CEO of DeLorme Maps, David DeLorme, designed the globe, while Lewiston-based surveyor and civil engineer, Vincent J.P. Leblanc, was involved in the building project.<ref>{{cite news |last1=Skelton |first1=Kathryn |date=18 June 2012 |title=People you know: Vincent J. P. leblanc -- late surveyor, engineer had his life mapped out |work=McClatchy - Tribune Business News |id={{ProQuest|1020821381}} }}</ref> Map technician Jeff Clark was responsible for the 792 plastic sections that cover the rotating globe.<ref name="Sharp1998" />

Eartha is contained in an [[Atrium (architecture)|atrium]] with several glass walls that allow it to be seen from outside of the building; it is readily visible from [[U.S. Route 1]]. At night, the globe is illuminated.<ref>{{Cite web|last=Team|first=Wordlesstech|date=2013-02-16|title=Eartha world’s Largest Rotating Globe|url=https://wordlesstech.com/eartha-worlds-largest-rotating-globe/|access-date=2020-10-12|website=wordlessTech|language=en-US}}</ref>

Eartha is constructed around a [[truss]] structure which is called ''Omni-Span'', and consists of over 6000 pieces of aluminum tubing. The map panels each cover 8 degrees of [[latitude]] and 10 degrees of [[longitude]], and are attached to the trusses with a custom-designed system of hidden bolts.