1. The sun goes around the earth.

2. The Sun goes around the Earth.
[Do we have to capitalize 'sun' and 'earth'? Which one is commonly used?]

Earth is capitalized, since that is the proper name of the planet in English. Sun is also a proper noun, so should also be capitalized. It's the name we have given (in English) to the star we revolve around, our star.

Did you catch Reed's correction for you?

It's the Earth that revolves around the Sun, not the other way around!

=)

1. The earth goes around the sun.

2. The Earth goes around the Sun.

In English grammar, when it comes to capitalizing celestial bodies like the sun and the earth, there are differing conventions.

1. The sun goes around the earth.
2. The Sun goes around the Earth.

Both of these sentences are grammatically correct, but they differ in their capitalization styles. In sentence 1, the words "sun" and "earth" are not capitalized. In sentence 2, "Sun" and "Earth" are capitalized.

When referring to celestial bodies as general concepts, it is common to use lowercase letters ("sun" and "earth"). This applies when talking about these objects in a scientific or astronomical sense.

On the other hand, if you are using the specific names for these celestial bodies, then they are capitalized ("Sun" and "Earth"). This is because we consider them proper nouns, similar to how we capitalize names of people or specific locations.

So, in a sentence like "The Sun goes around the Earth," we are using the proper names of these celestial bodies, so they should be capitalized. However, in a sentence like "The sun is a star," we are referring to the general concept of a sun, so it remains lowercase.

It is important to note that different style guides, publications, or contexts may have their own guidelines, so it's always a good idea to check the specific requirements or preferences of the writing style you are using.