feat: Unit-spherical coordinates

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.92%. Comparing base (c6ce7e3) to head (d7608c8). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #198 +/- ## ========================================== + Coverage 95.85% 95.92% +0.07% ========================================== Files 77 78 +1 Lines 2893 2947 +54 ========================================== + Hits 2773 2827 +54 Misses 120 120 ```

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