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About the IES
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IES Staff
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IES Committees
Information
Newsroom
Annual Report
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Membership
Join
Committees & Panels
Sustaining Membership
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Information
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IES Progress Report
Featured Events
Light + Justice Symposium
IES24 Conference
Street & Area Lighting Conference
Research Symposium
Special Events
Illumination Awards & Gala
Lighting Education Tour
Aviation Lighting Conference
Research & Education
Research
About IES Research
Publications
FIRES Forum
Past Projects
IES Lighting Ready Reference App
Education
eLearning Portal
Upcoming Webinars
Request IES CEU/AIA-LUs
LC Study Group
Register Now for Our Next Webinar
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Browse Standards
Nomenclature & Definitions
Standards Errata & Addenda
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IES Standards Toolbox
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Quantifying Light Pollution Sources: The Quintic Root of Hipparchus
April 19, 2021
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