Because of the light on the cities and people don't take time to look at the beautiful sky.
Astronomers know that there isn't really a "celestial sphere", a globe of crystal in which the stars are embedded. But it is often convenient to talk of a "sphere" around the Earth, in which all the stars and planets move. And sometimes it makes the math a whole lot easier. Navigators do all their calculations AS IF all the stars were stuck to a crystal sphere, and the Moon and planets wandered around inside it.
the flashlight causes objects to appear larger and easier to see.
The celestial sphere is a sphere, which contains the sky and encompasses the entire earth and has earth as the center of the solar system. While we know this not be true the model does allow for a more convient way to view what is around us. So basically the model makes it easier for us to see constellations, asterisms, planets and stars in easy to understand model. That is why it is a model and not a 100% accurate figure.
Charles Messier was an astronomer from the 1700s who created a guidebook to certain star groupings and nebulae. He created the guide so that other astronomers would have an easier time finding objects in the night sky.
You can use kilometers if you like. On the other hand, distances within the Solar System are often quoted in AU (astronomical units), where 1 astronomical unit is the distance from Sun to Earth. Such distances are easier to visualize.
As population and population density has grown, the brightness of lights in cities and towns have made it harder to see celestial objects. Generally, you need to travel to areas that provide enough darkness to see many objects in the sky. Going back in time, there was less light in areas of the world.
There is too much light pollution now days, and also there is too many distractions, as in: a lot of people don't usually look up at the stars every night. We play on the computer, watch TV, etc.
As common sense would suggest, it is easier for them to lift light objects.
Because ancient Egypt did not have a caste system. They did not believe in Hinduism and have over 3000 gods. In fact, in ancient Egypt it was easier to move through the ranks of jobs than in other ancient cultures such as ancient India or ancient China.
A anonymous being from ancient times who wanted to make the transporting of goods easier, so attached circular objects to the side of a cart, and thus making it easier than dragging it along.
Astronomers know that there isn't really a "celestial sphere", a globe of crystal in which the stars are embedded. But it is often convenient to talk of a "sphere" around the Earth, in which all the stars and planets move. And sometimes it makes the math a whole lot easier. Navigators do all their calculations AS IF all the stars were stuck to a crystal sphere, and the Moon and planets wandered around inside it.
because they are smaller than larger objects
Grouping objects is an important organizational skill. You should group like objects to keep things orderly and easier to find or understand.
easier for us to knowing different objects by their shapes, colours and textures
It is easier to cut certain objects.
To organize similar objects for easier management
cut stuff