Observed arrival · 2026-10-21
Yozora Atlas maps the night sky’s darkness
A searchable atlas estimates night-sky darkness across 2,080 towns and parks in the US, Canada, the UK, and Ireland.
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◎Niche
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- For
- Stargazers choosing a darker place to observe
- Worth noticing
- Readings use mag/arcsec², where lower numbers indicate brighter skies; the site also lists 2,080 towns and parks across four countries.
Field notes
The homepage describes sky brightness in mag/arcsec² and notes that the scale runs backwards: lower numbers mean brighter skies. It lists 1,504 US locations, 235 in Canada, 299 in the UK, and 42 in Ireland. The readings are attributed to 2025 NASA satellite images of nighttime light; the extracted page does not explain the calculation method in further detail.
Observed signals
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Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
●ProPolished or operationally mature
◎NicheUnusually specific use
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