What Does Version History Track?
Version history tracks material changes to calculator logic, page content, source references, visual diagrams, navigation links, trust pages, schema, and publishing architecture. Small spelling changes and routine wording edits are not always listed.
Material changes include new calculators, new support pages, revised formulas, canonical URL corrections, duplicate-intent cleanup, source updates, disclaimer changes, privacy changes, and published article batches. These changes can affect how users interpret results.
Routine changes include minor grammar edits, small spacing changes, non-material CSS tweaks, and internal wording polish that does not change meaning.
Support Page Expansion
Support page expansion added calculator-adjacent pages that answer location, latitude, month, country, and chart questions without creating duplicate article intent.
Support pages include Solar Panel Angle by ZIP Code, Solar Panel Angle by Latitude, Solar Panel Angle by Month, Solar Panel Angle by Country, and Solar Panel Tilt Angle Chart. These pages support calculator use directly and prevent the homepage from becoming overloaded.
The country page owns country-level interpretation. The month page owns 12-month tables. The latitude page owns formula baseline. The ZIP-code page owns US postal-code lookup.
Article Cluster Expansion
Article cluster expansion created topical support around tilt formulas, seasonal angle, roof geometry, solar orientation, sun position, and performance loss. Each article owns one distinct intent.
The article architecture includes angle guides, seasonal tilt guides, orientation guides, solar-position explainers, roof solar-angle guides, and performance guides. The internal link structure connects calculators to articles only where the user journey needs more explanation.
Duplicate pages were avoided where a calculator or support page already owned the intent.
Visual and Design Updates
Visual updates added page-specific diagrams, source-aware trust cards, reviewed-author patterns, and support-page layouts instead of repeating one generic article template across all pages.
Calculator and article pages can use different visual patterns when the content needs different explanation. Formula pages need formula visuals. Roof pages need roof geometry. Country pages need hemisphere and latitude patterns. Trust pages need source hierarchy and limitation signals.
This design approach supports readability and reduces programmatic sameness.
Technical SEO Cleanup
Technical SEO cleanup removed stale placeholder URLs, replaced old internal links, avoided unnecessary redirects, and separated pages that had duplicate parent-child content.
Clean URL ownership matters. Old placeholder paths were removed from visible navigation instead of being hidden with local redirects. The by-country page now uses `/solar-panel-angle-calculator/by-country/`. The methodology hub and full methodology page have different H1s, different content, and different intent.
How Are Future Versions Recorded?
Future versions are recorded when a change affects calculator behavior, page intent, trust language, source hierarchy, navigation, schema, accessibility, or published content architecture.
A useful version note includes date, page or feature affected, change type, reason, and user impact. Version history does not need to list every typo correction. Version history must list any change that could affect trust, interpretation, or technical SEO.
Updated: April 12, 2026.