Chronological is something belonging or linked to the timeline (discipline whose object is to determine the order and dates of historical events). The timeline is part of the science of history.
All civilizations have developed methods or systems to measure the time. We know that there's no historical event has not arisen from others before him and who was not at the origin of another more or less important. The chronological order of the events is the location of these on a time line (or a timeline).
For example, the invention of the wheel, the creation of the bicycle and the manufacture of the first car are three historical events. A chronological order would first put the invention of the wheel (located at the end of the Neolithic period, that is to say in the year 4000 BC), then the creation of the bicycle (at the end of the 15th century, about) and, finally, the production of the first car (late 19th century). There are instead of saying that the first car would have never been manufactured without the invention of the wheel.
What is chronological, ultimately, regarding the order and the measurement of time or the schedule. The seconds, minutes, hours, days, weeks, months, years, decades, centuries and millennia are some of the more common in everyday time-units.
Chronological order can be established in different ways. When analysing the history, it is customary to use large measures as decades or centuries. To establish a chronological order of the daily activities, it is more useful to appeal to the minutes or hours.