Here's why:
* Chapters are larger divisions within a book, often dealing with a distinct theme or plot point.
* Sections or parts are smaller divisions within chapters, often used to break down the information or narrative into manageable chunks.
For example, a history book might have chapters covering different historical eras, and within those chapters, sections that focus on specific events or developments.
Other terms you might see used include:
* Subsections: These are even smaller divisions within sections.
* Paragraphs: While paragraphs are primarily used to organize text within sections, they can also be used to mark smaller breaks in time within a section.
Ultimately, the specific terminology used will vary depending on the author and the type of time book.