Legacy article – Astronomy and observation

Sunspot 1089 – green filter

Original publication date

26 July 2010

Original section

Astronomy and observation

Original slug / legacy ID

sunspot-1089-green-filter / 146

Restored on current site

martinpeniak.com/archive/writing/sunspot-1089-green-filter/

Editing scope

Period voice retained; spelling and formatting lightly cleaned.

Originally published 26 July 2010 on the earlier martinpeniak.com site.

Preserved as part of the astronomy and observation thread around cameras, optics, and the sky. The article keeps its period voice, with light formatting cleanup.