EM Spectrum
Ultraviolet (UV-A)
900.0 THz
Cosmic Octave Color
Derived visible color (666 nm)
Display swatch #cc482d
Octave-shifted: 13.1 kHz (-36 octaves)
EstablishedPhysical Measurement
Evidence Level
Established
Source Count
1
Last Reviewed
March 23, 2026
Directly measured, standardized, or well-supported in mainstream scientific or technical literature.
This entry documents a measurable or standardized frequency reference. The atlas is a research and practice guide, not a medical diagnostic instrument.
Review the evidence modelUV-A radiation (315–400 nm). Causes skin tanning and aging. Not fully blocked by atmosphere.
Claim Type
Physical Measurement
Cosmic Octave Color
Derived visible color (666 nm) · #cc482d
Source
Physics
Sources
Optics and Physics References
2 atlas references
Used for visible-light wavelengths, electromagnetic ranges, and general physics conversions.
Optics, physics, and electromagnetic-spectrum references.
Nearby in the Atlas
Entries within ±35 cents of this tone when reduced to the same octave — candidates for pairing or comparison.
Uranus Orbit (Cosmic Octave)Planetary Cycles
207.36 Hz+22.9¢
Paiste Planetary Gong — UranusInstrument Resonances
207.36 Hz+22.9¢
G#1Musical Frequencies
51.91 Hz+25.2¢
G#3Musical Frequencies
207.65 Hz+25.3¢
G#4Musical Frequencies
415.30 Hz+25.3¢
G#5Musical Frequencies
830.61 Hz+25.3¢
ultravioletem-spectrum