4 ms·
This was a big deal in Tucson for a while. It used to be that there was a city ordinance that mandated public outdoor lighting was all sodium lamps because it w
by lozaning 7y ago
This was a big deal in Tucson for a while. It used to be that there was a city ordinance that mandated public outdoor lighting was all sodium lamps because it was super easy for the local observatory to filter out that one frequency of light.