Defining "time" has always been something hard to do. We can not see it, smell it or taste it but its effects can be felt. A time period is the time range in a given point in which an event happened, it is a unit of measurement to categorize them.
To understand what exactly happened in a certain event in history, we need to know how to suit events into their right "place in time". So, chronological order is always important when it comes to events.
Ordering things or events in chronological time helps you determine the temporary order in which they happened, why they happened (sometimes the reasons why they were made are related to the ideals of that time period), and the resolution they had.
