south hemisphere in progress, improved documentation in progress

[gregstarr]

fixing issues:

• duplicate times in new labels #1
• can't finish through 2022 #2
• odd arb example #4
• add southern hemisphere #10

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (master@107d1e4). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #7   +/-   ##
=========================================
  Coverage          ?   95.70%           
=========================================
  Files             ?       20           
  Lines             ?     1584           
  Branches          ?        0           
=========================================
  Hits              ?     1516           
  Misses            ?       68           
  Partials          ?        0           

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