Thank you for your patience while we retrieve your images.

San Francisco City skyline Alcatraz and The San Francisco–Oakland Bay Bridge at twilight in San Francisco Bay Area_California_Rob Badger

Looking southeast over the Coastal hills and Richardson Bay to Sausalito, Alcatraz, The San FranciscoÐOakland Bay Bridge and San Francisco at evening twilight. Taken from from Mount Tamalpais State Park (Marin County, California, USA) in the Coastal Range, on a rare, crystal clear January night after a winter storm cleared the air in the Bay Area.
California State Route 1 is seen in the immediate foreground.
Visibility was over 60 miles.

The north tower of the Golden Gate Bridge is seen on the right.
The blue color on the land is created by a fading blue sky after the sun has set.

According to Wikipedia:
"Twilight is the illumination of the Earth's lower atmosphere when the Sun itself is not directly visible because it is below the horizon. Twilight is produced by sunlight scattering in the upper atmosphere, illuminating the lower atmosphere so that the surface of the Earth is neither completely lit nor completely dark. The word "twilight" is also used to denote the periods of time when this illumination occurs.

"The further the Sun is below the horizon, the dimmer the twilight (other things such as atmospheric conditions being equal). When the Sun reaches 18 degrees below the horizon, twilight's brightness is nearly zero, thus evening twilight ends, and night begins. When the Sun again reaches 18 degrees below the horizon, night ends and morning twilight begins. Owing to its distinctive quality, primarily the absence of shadows and the appearance of objects silhouetted against the bright sky, twilight has long been popular with photographers, who refer to it as 'sweet light', and painters, who refer to it as the blue hour, after the French expression l'heure bleue.

Categories & Keywords
Subcategory Detail:
Keywords:Alcatraz, Alcatraz Island, Bay Bridge, California, California Highway 1, California State Route 1, East Bay, January, Marin, Marin County, Northern California, Rob Badger, San Francisco, San Francisco Bay, San Francisco Bay Area, San Francisco Oakland Bay Bridge, Sausalito, The San FranciscoÐOakland Bay Bridge, US Highway 101, United States, West, bay, beauty, black, blue, blue hour, bridge, city lights, cityscape, clear air, coastal range, cool tones, dark blue, dark yellow, dramatic, dusk, evening twilight, from Mount Tamalpais, healthcare, healthcare art, high resolution, hills, horizon, horizontal, landscape, light yellow, nature, rolling hills, scenic, sky, soft light, tranquil, twilight, view from Mount Tamalpais, view from Mt Tam, winter, yellow

San Francisco City skyline Alcatraz and The San Francisco–Oakland Bay Bridge at twilight in San Francisco Bay Area_California_Rob Badger