Implement greatCircle#214

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tiinsy wants to merge 8 commits intodartclub:mainfrom

deanpapas:feature-great-circle-final

Commits on May 2, 2025

temporary saved changes
tiinsy
committed

Commits on May 6, 2025

testing overhaul changes
tiinsy
committed

Commits on Jun 2, 2025

added comments to feature greatCircle
tiinsy
committed

Commits on Jun 5, 2025

fixed test erros, added test comments
tiinsy
committed