Consolidate deg/rad conversions and bins creation in code

[eumiro]

This is just a refactoring PR (no bug and no feature) and hopefully improved the consistency and readability of the code.

Some numpy functions need radians and these were calculated in different ways. This PR consolidates them to the usage of deg2rad and rad2deg. The second commit suggests a more descriptive creation of bins.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.44%. Comparing base (29c06c0) to head (90fb095).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1281   +/-   ##
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  Coverage   98.44%   98.44%           
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  Files          24       24           
  Lines        2383     2383           
=======================================
  Hits         2346     2346           
  Misses         37       37           

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[gboeing]

Thanks!