It is used at the beginning of sentences, verses or direct quotes. It is used in the names that designate higher religious or political concepts. It is used in the titles of books, newspapers, magazines, artistic productions, literary and scientific. It is used in the names of the persons. It is used in the names of historical periods and official dates. It is used in the names of roads and public places. It is used in the names of arts, sciences or disciplines. It is used in the names of the cardinal points, or indicate regions. It is used in the names of celestial bodies. It is used in the names of institutions related to education, buildings and public or private establishments. It is used in the names that designate high office, people in high positions (President). It is used in the names of historical periods and official dates.

Only countries are capitalized. Nationalities and days aren't.