Timeline and Sources of History
"History is 'an unending dialogue between the present and the past, between the society of today and the society of yesterday. ... We can fully understand the present only in the light of the past.'" — E.H. Carr[cite: 8]
The Big Questions
- How do we measure historical time?[cite: 8]
- How can various sources help us understand history?[cite: 8]
- How did early humans live?[cite: 8]
How Do We Learn About the Past?
History is the study of the human past[cite: 8]. While Earth has a long history spanning 4.54 billion years, humans occupy only a tiny and recent part of it[cite: 8].
Key Experts Studying Earth and Human History:
- Geologists: Study physical features of the Earth, like soil, stones, hills, mountains, rivers, and oceans[cite: 8].
- Palaeontologists: Study remains of plants, animals, and humans from millions of years ago in the form of fossils[cite: 8].
- Anthropologists: Study human societies and cultures from the oldest times to the present[cite: 8].
- Archaeologists: Study the past by digging up physical remains left behind, such as tools, pots, beads, toys, bones, teeth, and burnt grains[cite: 8].
How Is Time Measured in History?
Each society has had unique ways of measuring time, often using major events like the birth of an important person or ruler's reign to mark a new era[cite: 8]. Today, the Gregorian calendar is used worldwide[cite: 8]. Beside it, Hindu, Muslim, Jewish, and Chinese calendars are also used for calculating festival dates[cite: 8].
Gregorian Calendar Essentials:
Consists of 12 months (365 days) with a leap year every 4 years[cite: 8]. Century years (e.g., 1800, 1900, 2000) are leap years only if divisible by 400[cite: 8].
Common Era (CE) and Before Common Era (BCE)
Years are counted forward or backward relative to the conventional birth year of Jesus Christ[cite: 8]:
- CE (Common Era): Formerly designated as AD (Anno Domini)[cite: 8]. Counts forward from year 1 CE[cite: 8]. Example: 1947 CE (India's Independence)[cite: 8].
- BCE (Before Common Era): Formerly designated as BC (Before Christ)[cite: 8]. Counts backward from year 1 BCE[cite: 8]. Example: 560 BCE (Approximate birth year of Gautama Buddha)[cite: 8].
In the Gregorian calendar, there is no year zero[cite: 8]. Year 1 CE immediately follows year 1 BCE[cite: 8]. To calculate total years elapsed between a BCE date and a CE date, add both years and subtract 1[cite: 8].
Formula: $\text{Total Years} = (\text{BCE Date} + \text{CE Date}) - 1$[cite: 8]
Example: Buddha born in 560 BCE to 2024 CE: $560 + 2024 - 1 = 2,583 \text{ years ago}$[cite: 8].
Centuries, Millennia, & Panćhānga
| Term | Duration | Example |
|---|---|---|
| Decade | 10 Years | 2010 to 2019[cite: 8] |
| Century | 100 Years | 21st Century CE (2001 to 2100)[cite: 8] |
| Millennium | 1,000 Years | 3rd Millennium CE (2001 to 3000)[cite: 8] |
In India, traditional calendars rely on the relative positions of the sun and moon[cite: 8]. A Panćhānga is a book of tables listing dates along with astronomical data such as solar/lunar eclipses, sunrise/sunset times, weather predictions, and festival dates[cite: 8].
What Are the Sources of History?
A source of history is any person, text, object, or place from which historical information is gathered[cite: 8]. History operates like a jigsaw puzzle where individual objects tell parts of a story[cite: 8].
Major Categories of Historical Sources:
- Archaeological Sources: Excavations, habitations, burials, tools, weapons, figurines, ornaments, pottery, toys, mounds, human/animal/plant remains, coins, copper plates, and monuments[cite: 8].
- Literary Sources: Indian literature (Vedas, Itihasas, plays, poems, scientific texts, historical chronicles) and Foreign accounts (travelogues)[cite: 8].
- Artistic Sources: Paintings, panels, sculptures, and manuscripts[cite: 8].
- Oral Sources: Genealogical collections and folklore[cite: 8].
Let's Explore & Activities
- Family Tree Activity: Trace information across three generations (parents, grandparents, great-grandparents) and identify your sources (photos, diaries, memories)[cite: 8].
- Timeline Practice: Mark the 8th millennium BCE on the timeline (8000 BCE to 7001 BCE)[cite: 8].