This time difference is because of the spinning of the spherical earth around its assumed axis. Accordingly, the part of the sphere facing the sun would be in daytime while the opposite part would be in evening time. This is the basic principle of setting down the world time zones. Refer to link below for more information.
International trading.
There is change in time in different countries because different countries are on different longitudes.
apollo program
People wanted an international standard. For example, a unit like the pound was not standardized among different countries; to this day, different countries have "pounds" of different sizes.
It is difficult because countries collect data in different ways and some countries collect data on expenditures instead of incomes.
Different countries and cultures use masks in various ways. In most cases, masks are used as a form of art, in acting and as a symbol of something different from the true self among others.
You can certainly have your feet in two different countries at the same time.
A committee that attempts to create more harmony among the accounting practices of different countries by identifying preferred practices and encouraging their worldwide acceptance. what's glossary
Emile
It mobilises the different products and factors of production among the countries. Here the world becomes a global village
You dont know it changes from time to time. It is also different for different countries
"Countries throughout the nation"? Country and nation means the same thing. Different countries (or nations) over the world have quite different sizes. For example, Brazil is half of South America, the other half is divided among 10 countries or so.