In Western astrology, the planet Jupiter  is associated with merrymaking. According to Manilius, Jupiter is temperate and benign, and presides over the stomach. Called "The Bringer Of Jollity" in Alan Leo's What is a Horoscope?, Jupiter is associated with the principles of growth, expansion, faith, prosperity and protecting roles. Jupiter is the ruling planet of Sagittarius, and was also that of Pisces prior to the discovery of Neptune. Many astrologers still consider Jupiter to be the Planetary Ruler of both Sagittarius and Pisces.

Jupiter is associated with Thursday. Dante Alighieri associated Jupiter with the liberal art of geometry.

In Chinese astrology, Jupiter is ruled by the element wood. In Indian astrology, Jupiter is known as Guru or Brihaspati

Jupiter in the first house shows that this planet plays an important part shaping your personality. This can be both good and bad, depending on how it's handled. A first house Jupiter is broad-minded and optimistic. You focus on the brighter side of life. You are honest, trustworthy, and benevolent, and for these, you are well liked and popular. On the negative side, Jupiter here can make one too self-indulgent, extravagant, or conceited. Being the planet of expansion, you may have to deal with a weight problem. Anyway, this position increases your self-confidence and gives you a somewhat dignified manner, especially as you grow older. You are likely to have strong religious or moral convictions. This gives you the capacity to become an authority or a leader in whatever field of endeavor you select. This may be especially so in activities relating to religion, education or social development.

Jupiter in the second house playing an important part shaping your attitudes toward money, material issues, and your sense of worth. Anyway, you are a fortunate person regarding money and property. This placement can have a negative side in that you may spend about as freely as you earn, and you may have a tendency to overextend yourself in a financial sense. Self-doubts that may be expressed elsewhere in the chart, evaporate when it comes to making and spending money.

Jupiter in the third house shows Jupiter plays an important part shaping a mentality that is optimistic, philosophic, and spiritually inclined. This expands the capacity for learning in the fields of education, philosophy, writing, publishing and communication. You are very fortunate in the educational opportunities that you receive early on. Your relationship with your brothers and sisters, and other relatives is very good, and beneficial to you long term

Jupiter residing in the fourth house shows that the planet plays an important part shaping a devotion to home and family and often the receipt of help from parents well beyond the formative years. You gain a great deal from the influence of your parents, especially your mother. Because of early circumstances, you may enjoy many social and educational advantages. This position also suggests that the latter half of life will be full and fortunate. The fourth house describes circumstances in the late life, and Jupiter is the planet of expansion and good fortune.