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During the year (what we call years) the earth has its own patterns of change, cold, hot, wet and dry, apart from the different stations.

"There are 52 weeks in a year, 4 of these weeks are lost in the distribution of the 12 months ... in many of the countries that adopted this system only paid 48 weeks of salary"
4 weeks X 12 months = 48 weeks
52semanas X 12 months = 4.3333 ..
4 weeks X 13 months = 52 weeks