Simple Definition of so
: to a degree that is suggested or stated
: to a great degree
: very or extremely
: without any doubt
http://www.merriam-webster.com/dictionary/so
In this case, "so" takes the meaning of the first explanation.
It is easy to understand the calendar we use today. It was not always so easy. -> It is now easy to understand the calendar but, in the past, understanding the calendar was not as easy as today.
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