| 1. |
What are the objects contained in the solar system? |
| 2. |
What is the structure of the Sun? |
| 3. |
What are the major solar activities? |
| 4. |
What are classifications of the eight planets? |
| 5. |
What are the characteristics and nature of Mercury? |
| 6. |
What are the characteristics and nature of Venus? |
| 7. |
What are the characteristics and nature of Mars? |
| 8. |
What are the characteristics and nature of Jupiter? |
| 9. |
What are the characteristics and nature of Saturn? |
| 10. |
What are the characteristics and nature of Uranus? |
| 11. |
What are the characteristics and nature of Neptune? |
| 12. |
What are the characteristics and nature of Dwarf planets? |
| 13. |
What is a calendar system? And what are its basic elements? |
| 14. |
How many calendar systems are available? |
| 15. |
Why are the month lengths of a solar calendar so irregular? |
| 16. |
Why is there a leap year? And what is its regularity? |
| 17. |
Why are the months of a lunar calendar called synodic months? Why are there differences in the length of a month? |
| 18. |
Does full moon always occur on the fifteenth day in a lunar month? |
| 19. |
What are the so-called 24 solar terms? |
| 20. |
Why is there a leap month for the agricultural calendar? |
| 21. |
How many ways were the beginning of a year calculated in ancient times? And when are their respective starting dates? |
| 22. |
What is a Julian Period? |
| 23. |
What is a Ganzhi Period? |
| 24. |
What are the time systems? |
| 25. |
What is a sundial? How many types of sundials are there? |