Where did the big and small days come from? If "Big Day Two" refers to a person's geographical origin or hometown, then according to the description of the problem, it is impossible to determine where he is from. Because "Da Tian Er" is just a name or nickname, it can't accurately reflect a person's regional background.

To determine a person's geographical origin, usually need to consider the following aspects:

1. Birthplace: A person's birthplace is usually related to his geographical origin. For example, a person born in Beijing can be considered a Beijinger.

2. Hometown: A person's hometown usually refers to the geographical location of his or her family or residence. For example, if a person lives in Guangdong, he may be considered a Cantonese.

3. Growing environment: The environment and geographical location where a person grew up may also have an impact on his geographical origin. For example, if a person grows up in Shanghai, they may be considered as Shanghainese.

4. Immigration background: If a person's family has had immigration experience, then his native place may be related to his immigration history and ancestral home. For example, if a person's ancestral home is Hubei, but their family immigrated to the United States, then they may be considered as Hubei Americans. The question and answer content of this article is based on the perspective and viewpoint from the beginning of rebellion.

To sum up, more details and background information are needed to determine a person's native place or hometown. According to the information provided in the question, it is impossible to accurately answer where "Da Tianer" is from.