Astronomy in India — Revision Notes
CBSE · Class 11 · Knowledge Traditions and Practices of India
Astronomy in India revision notes for CBSE Class 11 Knowledge Traditions and Practices of India: 4 topics in quick points.
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Key Topics to Revise
Indian calendar and timekeeping
- The Hindu calendar is a luni-solar calendar.
- A lunar month is used for festivals and auspicious days, while a solar month is used for daily life.
- The sidereal period of the Moon is 27.3 days.
Explanation of eclipses and related ideas
- Solar eclipse occurs when the Moon is between the Earth and the Sun.
- Lunar eclipse occurs when the Earth is between the Moon and the Sun.
- Eclipses occur only on full moon or new moon days.
Uttarāyaṇa, Dakṣiṇāyana, and seasonal change
- The duration of sunlight in a day changes throughout the year.
- Longer sunlight hours coincide with summer, and shorter sunlight periods occur in winter.
- The position of sunrise shifts towards the north, then south, and then north again in a yearly cycle.
Ancient Indian astronomers and mathematicians
- Āryabhaṭṭa was born in 476 C.E. near modern Patna.
- Āryabhaṭṭa wrote Āryabhaṭīyam at age 23.
- Āryabhaṭṭa introduced the concept of the celestial sphere, large number units, week days, and the adhikamāsa scheme.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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