#lickobservatory — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #lickobservatory, aggregated by home.social.
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@futurebird More than 40 years ago, the #CityOfSanJose agreed to switch all of the street lights to low-pressure sodium-vapor lamps, because their light is a monochromatic yellow with a wavelength near 589 nm that could be filtered out by the telescopes at #LickObservatory. They were also more energy efficient. The effort was somewhat half-assed, since upscale mechants didn’t like the aesthetics and the PD didn’t like the loss of color—you can’t tell a purple car from a green one. Early LEDs were monochromatic, I think, but white LEDs are not.