How do the position and direction of the light source and shape of the object affect shadows? Answer: They affect the direction and length of the shadows.

阴影在日常生活中有哪些影响？

既有正面影响也有负面影响

古代计时仪器有哪些？

What are some ancient timing instruments? Answer: Sundial, water clock, and hourglass, etc.

日晷是什么？

一种古老的计时器

Study Notes

Shadows are formed by light and opaque objects.
The position and direction of light source and shape of the object affect the shadow.
Shadows have both positive and negative impacts on daily life.
The length and direction of shadows change throughout the day.
Shadows change from long to short and then back to long during the day.
Shadows move from west to east during the day.
The direction and length of shadows change throughout the day.
Sundial is an ancient timing instrument.
Sundial consists of a dial and a gnomon.
Sundial and other timing tools such as water clocks and hourglass led to the invention of modern clocks.

How much do you know about shadows and timekeeping devices? Test your knowledge with this quiz and discover interesting facts about how shadows are formed, the impact of shadows in our daily lives, and the history and function of ancient timing instruments like the sundial. With questions that cover everything from the position of light sources to the movement of shadows throughout the day, this quiz is sure to challenge your understanding of these fascinating topics. So, get ready to shine a light on your knowledge and take the quiz now