This precision set of 11 tuning forks is calibrated to the tones of the Sun, Moon, Earth, Mars, Venus, Jupiter, Neptune, Mercury, Saturn, Uranus, and Pluto. The exact tones were calculated by Hans Cousto, the Swiss mathematician, using an octave based on the time for planets to revolve around the Sun. These tuning forks are specifically tuned with cosmological and astronomical timing. Includes Sun (transcendence), Moon (sexual energy), Earth (relaxation & meditation), Mars (creativity, will power, masculine), Venus (love, harmony, feminine), Jupiter (art & creation), Neptune (intuition & dreams), Mercury (communication & voice), Saturn (concentration & awareness), Uranus (spontaneity & openness), and Pluto (group & interpersonal integration).