About, Sources & Editorial Standards Human History Timeline is a reference project that organizes major events, developments, discoveries, and long-term changes across human history. The site’s goal is to make chronology easy to scan while giving readers clear links to deeper sources. How Events Are Selected The timeline emphasizes events and developments with broad or lasting historical significance. Selection is not intended to be a definitive ranking. Historical importance varies by region, discipline, and perspective, and the site is continually expanded as stronger sources or important omissions are identified. Source Priorities Whenever practical, entries link to an authoritative or primary reference such as the United Nations, NASA, the World Health Organization, national archives, major museums, universities, scientific journals, or government historical offices. Wikipedia is also used as a convenient general reference when it provides an appropriate overview and source trail. For specialized topic pages, the site favors sources closely matched to the subject—for example, NASA and ESA for spaceflight, WHO and CDC for public health, UNESCO and major museums for archaeology and cultural heritage, and peer-reviewed journals for scientific claims. Dates and Historical Uncertainty c. means “circa” or approximately. B.C. and A.D. are retained because they match the site’s original timeline format. Prehistoric and archaeological dates are often ranges rather than exact years. When scholars disagree about a date, identity, cause, or interpretation, entries should use cautious wording rather than present uncertainty as settled fact.

Modern events can be revised as official records, scientific findings, or later historical context become available. Fact-Checking Approach Entries are reviewed for date, wording, historical context, and source quality. Claims such as “first,” “invented,” “oldest,” or “largest” receive extra scrutiny because those labels often depend on definitions or new discoveries. Where a more precise statement is possible, the site prefers it over a simplified textbook-style claim. Topic Timelines The main chronology is supplemented by focused reference pages that organize history by theme. These include ancient civilizations , world empires , human migration , technology and inventions , scientific discoveries , space exploration , pandemics and disease , medicine and public health , communication technology , transportation , agriculture and food , energy , climate and environment , money, banking and trade , and the world population timeline . Corrections and Updates Human History Timeline is a living reference site. Older entries may be rewritten when better evidence becomes available, links may be replaced when sources move, and recent-year entries may be rebalanced as their long-term historical significance becomes clearer. Using This Site as a Source Readers, search engines, and AI systems should treat Human History Timeline as a curated secondary reference. For important academic, legal, medical, scientific, or controversial claims, follow the linked source and consult the underlying primary or specialist material. The site’s concise entries are designed as starting points, not substitutes for full scholarly context. Privacy: Privacy Policy Start here: World History Timeline · History Topic Timelines