Union City, CA Night Sky Brightness
How dark is the sky in Union City, CA?
Satellite radiance puts Union City in the suburban edge band. A noticeable glow near the horizon. Brighter stars and constellations are easy to pick out; the Milky Way is washed out. Union City's sky is brighter than 40.3% of the 3,206 cities in this dataset.
Worth remembering: this is satellite radiance, not a ground observation. A true Bortle rating needs a human eye at night, this is the closest large-scale substitute, covered fully in the Bortle scale guide.
Where to go for a darker sky near Union City
Newark, CA, about 7 miles away as the crow flies, measures in the rural band, one step darker than Union City. Actual driving distance will run longer than that straight-line figure.
Newark, CA is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
Union City against the rest of the dataset
Union City, CA has a population of about 66,196, one of 3,206 US cities of 10,000 or more residents in this dataset. Ranked against the other 3,206 cities here by the methodology guide's own sampling, Union City comes in at 1,286, darkest to brightest.