The Gregorian calendar (also known as the solar calendar) has two constellations in January, which are: from January 1st to January 20th is Sagittarius; and from January 21st to January 31st is Aquarius.

Sagittarius Basic Introduction:

Yin-Yang: Yin
Element: Earth sign
Symbol: Absolute consciousness, ideals and aspirations
Best Match: Taurus Virgo Pisces
Personality Analysis: Sagittarius is one of the most patient, cautious, and kind constellations among the twelve. They work steadily and are also quite stubborn, not letting go until they achieve their goals. Their ability to endure is surprisingly strong, and they are also very hardworking. They always carry a lot of sense of responsibility in their hearts, but often lack a sense of security and do not fully trust others.

Aquarius Basic Introduction:

Yin-Yang: Yang
Element: Air sign
Symbol: An innovator with strange and novel ideas
Best Match: Libra Aquarius
Personality Analysis: People born under Aquarius are smart. Their greatest characteristic is innovation, pursuing a unique life, and being highly individualistic. They are friendly yet value privacy. Aquarius can certainly be called the "Star of Friendship," as they enjoy making friends of all kinds, but it takes a long time to truly get close to them. They tend to be cold and distant towards their family members.