Astrological sign of a sign are together sufficient to define it, they can be grouped to indicate their symbolism. The first four signs, Aries, Taurus, Gemini and Cancer, form the group of personal signs. The next four signs, Leo, Virgo, Libra and Scorpio form the group of interpersonal signs. The last four signs of the zodiac, Sagittarius, Capricorn, Aquarius and Pisces, form the group of transpersonal signs. Dane Rudhyar presented the tropical zodiac primary factors, used in the curriculum of the RASA School of Astrology. The tropical zodiac is the zodiac of seasonal factors as opposed to the sidereal zodiac (constellation factors).
Zodiac Aerospace participation in the war effort. Until the 1930s, 63 airships would leave Zodiac's workshops. In 1934, the company created the first prototype inflatable boats, ancestors of the renowned "Zodiac", which would contribute to the development of the civil and military inflatable boat industry. The company then benefited from the boom in leisure activities after the Second World War, as well as the French infatuation with recreational boating in the 1960s: Zodiac therefore developed inflatable boats for the civil market and gradually gave up the airship market for the more promising water sports market. Zodiac would nevertheless honor a contract in