# Calendrical vs. Sequential Timelines

Timelines can be a simple list of events that occur in order or events based on calendar dates. Simply select the type of timeline you want in the "Time Scale & Range" panel.

## Calendrical

A calendrical timeline reflects a span of time that starts on a specific calendar date and spans a specific number of years, months, days, hours, minutes, or seconds, depending on the selected scale. For example, a timeline starting in the year 1900 would end in 2000 if the scale were set to "Years" and the span were set to "100". A timeline could start in December 2006 and end in December 2007 if the scale were set to "Months" and the span were set to "12" and be used to show events occurring over a year's time by month.

## Sequential

A sequential timeline reflects a linear span of time that starts with a specific number and spans a number of intervals, irrespective of any date. A sequential timeline can be given any unit title (such as "steps", "phases", etc.). For example, you can create a timeline that starts with the number 1 and spans 49 intervals, then set the unit title to "chapters" to produce a timeline with 50 "chapters" to show the growth and actions of characters in a novel.