Commencing in Aries and concluding in Pisces, the 12 Rasi are suspended across the celestial ecliptic, encircling the Earth. Commonly known aspects of astrology, the Rasi are part of the backdrop in which one can calculate and study time.
Years and months are based on the progression of the Sun through the 12 Rasi. The Sun moves through the Rasi one degree per day, taking 30 days for one Rasi and 12 cycles for the whole zodiac. This makes 360 days or one solar year.
Like all other aspects of Astrology, each Rasi has its own characteristics and significations. In addition, each Rasi is ruled by one or more of the planets and holds domain over part of the human body for use in medical astrology.
Listed below are the 12 Rasi and some of their attributes and significations.
By j-journey - Own work, Public Domain, https://www.j-journey.com/j-blog/wp-content/uploads/2017/06/12-zodiac-months-no-months.jpg
Aries
Domain: Head
Element: Primary Fire
Planetary Ruler: Mars
Classification: Quadruped
Taurus
Domain: Neck
Element: Secondary Earth
Planetary Ruler: Venus
Classification: Quadruped
Gemini
Domain: Shoulder/Arms
Element: Tertiary Wind
Planetary ruler: Mercury
Classification: Human
Cancer
Domain: Chest
Element: Primary Water
Planetary ruler: Moon
Classification: Aquatic
Leo
Domain: Torso
Element: Secondary Fire
Planetary ruler: Sun
Classification: Quadruped
Virgo
Domain: the abdomen
Element: Tertiary Earth
Planetary ruler: Mercury
Classification: Human
Libra
Domain: Waist and Hips
Element: Primary Wind
Planetary ruler: Venus
Classification: Human
Scorpio
Domain: Genitals
Element: Secondary Water
Planetary Ruler: Scorpio and Ketu
Classification: Insect
Sagittarius
Domain: Thighs
Element: Tertiary Fire
Planetary ruler: Jupiter
Classification: First half human, second half quadruped
Capricorn
Domain: Knees
Element: Primary Earth
Planetary ruler: Saturn
Classification: First half quadruped, second half aquatic
Aquarius
Domain: Shanks/calves
Element: Secondary Wind
Planetary ruler: Saturn and Rahu
Classification: Human
Pisces
Domain: The feet
Element: Tertiary Water
Planetary ruler: Jupiter
Classification: Aquatic
A page from Michael of Rhodes' biographical manuscript, documenting his four decades of sea voyages, ca. 1445. The image relates to bloodletting, which was practiced according to the night sky's ruling sign — Source