January 20, 2023

* JAN 20, holidays and celebrations -- Robbie Burns Day

reprise from January 20, 2020

JAN 20, holidays and celebrations: Robbie Burns' Day 

Authors' Note: The mathematical expression in the second line of the fourth verse should be read as "sine-over-cos", cos being the mathematical abbreviation for cosine. The mathematical abbreviation for tangent is tan.


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