Chronological horizon refers to the timeline or period in history that is being studied or referred to. Some synonyms for chronological horizon include era, epoch, period, age, and timeline. These terms are used to describe a specific period of time in history that is defined by particular cultural, social, economic, or political changes. For example, the Renaissance era is often used to refer to the period in European history between the 14th and 17th centuries, which saw a resurgence in artistic, intellectual, and scientific achievements. Other examples of chronological horizons include the Industrial Age, the Age of Exploration, and the Digital Age, among others.