California Sky Quality Observations
Skykeepers
skykeepers.org founded September 1, 1999
Sky Quality Meter Readings taken in California
Links to other activities and measurement resources are found below.
Location Name
Location &
Map Links
Meter Reading
Date,  ddmmyy
Time, 24hr. local
Notes - SQM Model, Sky Conditions, Observer, Location, etc.
See SQM Notes 
Adin, Ca  Butte Creek RV Park Google Maps  -- 41.189324  -120.945284
21.425 7/3/08
00:15
Average 4 readings.  
Street lights near by but blocked by trees.
SQM Sn #0814, Jack Sales
GPS Location (DD M.MM) = 41°  11.375N  120° 56.715W
21.43 7/3/08
00:15
Average 4 readings.
Street lights near by but blocked by trees.
SQM Sn #2752,  Beverly Sales
Adin, Ca  Golden State Star Party  (GSSP) Google Maps  -- 41.133248  -120.976692 ,   Golden State Star Party
Frosty Acres Ranch near Adin, California
GPS Location (DD M.MM) = 41°  08.045N,  120° 58.691W   (7/3/08)
GPS Location (DD M.MM) = 41°  08.089N,  120° 58.747W   (6/21/09)
21.83 7/3/08
23:50
Average 4 readings.
SQM Sn #0814, Jack Sales
GPS Location (DD M.MM) = 41°  08.045N,  120° 58.691W
Clear Sky Charts for Adin
21.71 7/3/08
23:50
Reading pointing at  Pagasus (east of Milky Way) = 21.81
Average 4 readings.
SQM Sn #2752, Jack Sales
21.80 7/4/08
23:30
Average 5 readings.
SQM Sn #0814, Jack Sales
21.69 7/4/08
23:35
Average 5 readings.  Clear sky, pointing at Arcturus (Bootes).
SQM Sn #2752, Jack Sales
21.66 7/4/08
23:45
Average 5 readings.  Clear sky,
Pointing at Zenith (Cygnus, Andromeda).
SQM Sn #2752, Jack Sales
21.69 7/4/08
23:55
Average 5 readings.  
SQM Sn #0814, Jack Sales
21.74 6/21/09
23:15
Average 5 readings.  Clear sky, pointing at Arcturus (Bootes).
SQM Sn #2752, Bev Sales, Jack Sales
21.83 6/21/09
23:15
Average 5 readings.  Clear sky, pointing at Arcturus (Bootes).
SQM Sn #0814, Bev Sales, Jack Sales
21.71 6/23/09  
00:40
Average 10 readings.  Clear sky, pointing at Arcturus (Bootes).
SQM Sn #2752, Curt Barns,  Jack Sales
21.75 6/23/09  
00:40
Average 10 readings.  Clear sky, pointing at Arcturus (Bootes).
SQM Sn #0814, Curt Barns,  Jack Sales
21.32 6/23/09  
01:00
Average 10 readings.  Clear sky, pointing at Enif (Pegasus).
SQM Sn #2752, Curt Barns,  Jack Sales
21.64 6/23/09  
01:00
Average 10 readings.  Clear sky, pointing at Enif (Pegasus).
SQM Sn #0814, Curt Barns,  Jack Sales
Adin, Ca  near Pioneer Cemetery  Google Maps  -- 41.190184  -120.953143,  (Co. Road 89) 
21.76 7/6/08
23:00
Average 5 readings.  Clear sky, pointing at Arcturus (Bootes).
SQM Sn #0814, Jack Sales
Google Location 41.190184,-120.953143
DD MM.MMM 41° 11.415N, -120° 57.193W
21.78 7/6/08
23:10
Average 5 readings.  Clear sky, pointing to Zenith
SQM Sn #2752,  Beverly Sales
Google Location 41.190184,-120.953143
GPS Location 41° 11.415, -120° 57.193
21.61  7/6/08
23:20
Average 5 readings.  Clear sky, pointing to Zenith
SQM Sn #0814, Jack Sales
Google Location 41.190184,-120.953143
GPS Location 41° 11.415, -120° 57.193
21.78  7/6/08
23:30
Average 5 readings.  Clear sky,  pointing at Arcturus (Bootes)
SQM Sn #2752,   Jack Sales
Google Location 41.190184,-120.953143
GPS Location 41° 11.415, -120° 57.193
Alpine County Airport,  Markleeville Ca Google Maps -- 38.73010  -119.76805
Indian Creek Recreation Area (BLM Camp Grounds
21.50 9/7/07
22:25
No Moon, Milkyway visible, Some Smoke, Class 3 Bortle
Sierra Summer Star Party Location 38.73010 & -119.76805
SQM Sn #0814
DD MM.MMM   38° 44' 09" N,  119° 46' 01" W
21.71 9/7/07
23:55
No Moon, Milkyway visible, Some Smoke,  Class 3 Bortle
Sierra Summer Star Party Location 38.73010 & -119.76805
SQM Sn #0814
21:61
9/8/07
22:02
No Moon, Milkyway visible, Clouds,  Class 3 Bortle
Sierra Summer Star Party Location 38.73010 & -119.76805
SQM Sn #0814
Anza, Ca  OCA Club Site Google Maps -- 32.799937, -115.501306
21.34 2006-02-24 08:30:00  Zenith, clear, Bob, Orange County Astronomy Club Site
Note from Unihedron SQM Database
21.10 2006-02-24 05:00:00  Zenith, clear, Bob, Orange County Astronomy Club Site
Note from Unihedron SQM Database
20.92 2006-01-28 13:05:00  Zenith, clear, Bob, Orange County Astronomy Club Site
Note from Unihedron SQM Database
21.02 2006-01-28 06:00:00  Zenith, clear, Bob, Orange County Astronomy Club Site
Note from Unihedron SQM Database
20.84 2006-01-27 04:15:00  Zenith, clear, Bob, Orange County Astronomy Club Site
Note from Unihedron SQM Database
Balboa Park, San Diego, Ca Google Maps  -- 32.732021, -117.147882
17.96 2007-07-11 22:00:00  Zenith, clear  ( San Diego IDA )
Note from Unihedron SQM Database
Basalt Camp Ground, San Luis Res. SRA Google Maps  --  37.028917,-121.065329 and 37.028650,-121.062533
20.93 3/28/09
22:30:00
No Moon, Clear, Curt Barns,  Jack Sales
No lights visible. Limiting Magnitude 4.0, Orion Very low.
37.028650,-121.062533,  East side of camp ground
SQM Sn #0814
21.11 3/28/09
22:30:00
No Moon, Clear, Curt Barns,  Jack Sales
No lights visible.  Limiting Magnitude 4.0, Orion Very low.
37.028650,-121.062533,  East side of camp ground
SQM Sn #2752
  3/27/09
22:30:00
No Moon, Clear, Curt Barns,  Beverly Sales, Jack Sales
Limiting Magnitude 4.0, Orion Very low.
37.028917,-121.065329,  West side of camp ground.
  3/27/09
22:30:00
No Moon, Clear, Curt Barns,  Beverly Sales, Jack Sales
Limiting Magnitude 4.0, Orion Very low.
37.028917,-121.065329,  West side of camp ground.
Black Butte Lake,  Buckhorn Camp Ground Google Maps --  39.816043,  -122.370588, about 5 miles West of  Orland, CA 
21.87 4/16/09
00:00:00
No Moon, Very Good Seeing/Clear, Curt Barns, Jack Sales
Restroom lights off.
SQM Sn #2752
21.77 4/16/09
00:00:00
No Moon, Very Good Seeing/Clear, Curt Barns, Jack Sales
Restroom lights off.
SQM Sn #0814
21.70 4/15/09
21:40:00
No Moon, Very Good Seeing/Clear, Curt Barns, Jack Sales
Restroom lights off.
SQM Sn #2752
21.62 4/15/09
21:40:00
No Moon, Very Good Seeing/Clear, Curt Barns, Jack Sales
Restroom lights off.
SQM Sn #0814
21.55 4/14/09
21:30:00
No Moon, Very Clear, Curt Barns, Jack Sales
Restroom lights visible.
SQM Sn #2752
21.51 4/14/09
21:30:00
No Moon, Very Clear, Curt Barns, Jack Sales
Restroom lights visible.
SQM Sn #0814
21.61
5/12/07
17:55
No Moon, Milkyway visible, Very Clear Sky, Jack Sales
SQM Sn #0814
21.60
5/15/07
03:15
No Moon, Milkyway visible, Very Clear Sky, Jack Sales
SQM Sn #0814
Black Butte Lake,  Grizzly Flat Rec.   Area Google Maps  -- 39.749931,  -122.393381
21.55 2007-06-13 07:30:00  Zenith, clear , Keith Myers
Note from Unihedron SQM Database
Google Maps Location = 38.79731,-120.417023
SQM Sn #1556
Blue Canyon - Nyack Airport Google Maps -- 39.816043,  -122.370588
21.45 2008-09-27 11:35:00 Zenith, Clear, No moon,  Jack Sales
SVAS  2008 Star-B-Q
SQM Sn #0814,  Average of 6 reading.
39° 15.52  N  120° 42.47 W
21.48 2008-09-27 11:28:00 Zenith, Clear, No moon,  Bev Sales
SVAS  Star-B-Q
SQM Sn #2752,  Average 6 reading.
Borrego Springs, Ca Google Maps -- 33.239836,  -116.349335  
21.60 2006-04-01 01:15:00  Zenith, clear, San Diego IDA
Note from Unihedron SQM Database
Brannan Island SRA, Cottonwood Camp Ground Google Maps  -- 38.1094,-121.694258
Brannan Island SRA, Cottonwood Camp Ground
20.29 05/15/09
22:30
Clear, No moon,  Jack Sales,
SQM Sn #0814
Back of Site 90
GPS Location  38.1095,  -122.69435
20.49 05/15/09
22:30
Clear, No moon,  Jack Sales,
SQM Sn #2752
Back of Site 90
GPS Location  38.1095,  -122.69435
Bucks Lake, Sundew Camp Ground, Quincy, Ca Google Maps -- 39.901330,  -121.200280  
21.61
7/17/07
22:30

Clear, No moon,  Jack Sales,  Class 3 Bortle
SQM Sn #0814
Google Maps Location =39.901330, -121.200280
DD MM.MMM   39°  54.06N,  121° 11.99W
21.69 08/03/08
22:00
Very Clear, No Moon, No Smoke or Clouds, Bev Sales
SQM Sn #2752,  Average 5 reading.
Google Maps Location = 39.901342, -121.199316
21.69
08/03/08
22:20
Very Clear, No Moon, No Smoke or Clouds, Bev Sales
SQM Sn #0814,  Average 5 reading.
Google Maps Location = 39.901342, -121.199316
Bucks Lake, Lower Buck Camp Ground, Quincy, Ca Google Maps -- 39.899119,  -121.207641
21.70 8./1/08
21:55
Very Clear, No Moon, No Smoke or Clouds, Bev Sales
SQM Sn #2752,  Average 5 reading.
Location = 39.899124, -121.207625
MM DD.DD  39° 53.893N, 121° 12.443W
21.95 8./1/08
22:10
Very Clear, No Moon, No Smoke or Clouds, Bev Sales
SQM Sn #0814
Location = 39.899124, -121.207625
21.48 8./1/08
21:50
Very Clear, No Moon, No Smoke or Clouds, Jack Sales
SQM Sn #2752,
Location = 39.899124, -121.207625
22.05 8/1/08
23:05
Very Clear, No Moon, Smoke or Clouds, Zenith Jack Sales
SQM Sn #0814
Location = 39.899124, -121.207625
Cameron Park Rotary Club Community Observatory  Google Maps -- 38.726576, -120.867977
    Measurement anticipated
Located on Folsom Community College, Placerville, CA
DD MM.MMM  38.715 N,  -120.843  W
Citrus Heights, CA,  Rusch Park Google Maps -- 38.708972,  -121.295081
    Measurement anticipated
DD MM.MMM  +38° 42' 32.30", -121° 17' 42.29"
Citrus Heights, CA,  Woodbriar Way Google Maps -- 38.706243,  -121.322783
18.54 4/12/09
22:15:00
Clear, No moon,  Jack Sales
SQM Sn #0814
18.77 4/12/09
22:15:00
Clear, No moon,  Jack Sales
SQM Sn #2752
18.75 8/26/06 Clear, No moon,  Jack Sales
SQM Sn #0814
Google Maps Location = 38.706243,-121.322783
18.57 6/09/07
24:00
Clear, No moon,  Jack Sales
SQM Sn #0814
18.47
6/11/07
04:10
Clear, Crescent moon low in the east.  Local street light on.   Jack Sales
SQM Sn #0814
Dear Creek Hills, Sacramento County, Ca
Google Maps -- 38.526698, -121.075558  North of  Rancho Murieta (topozone) 
20.5
2006-08-26
xx:00 PDT
Clear Sky,   No Moon, Milky Way visible, 4.0 Bortle  - Jack Sales
Location, Latrobe Road, at gate to pond
Google Maps Location = 38.526698, -121.075558
GPS Location = 38.52671, -121.07441
SQM Sn #0814
20.36 2006-08-26
xx:00 PDT
Clear Sky,   No Moon, Milky Way visible,
Locaton, Corner of Latrope Road and Stone House Road
Google Maps Location = 38.518828, -121.101529
SQM Sn #0814
20.40 2007-08-11
22:00 PDT
Clear Sky,   No Moon, Milky Way visible, 4.5 Bortle  - Jack Sales
Location at pond, 38.52105 & -121.07042
Google Maps Location = 38.520957, -121.071632
SQM Sn #0814
20.36 2008-08-23
21:48 PDT
Clear Sky,   No Moon, Milky Way visible, B. & J. Sales
Location Corral at Latrobe Rd.
GPS DD.MM, 38° 31.610N, 121° 05.219W Google Maps
Pointing at Corona Borealis or SE of Arcturus (Bootes)
SQM Sn #2752,  Average 5 reading.
20.38 2008-08-23
21:49 PDT
Clear Sky,   No Moon, Milky Way visible, B. & J. Sales
Location Corral at Latrobe Rd.
GPS DD.MM, 38° 31.610N, 121° 05.219W, Google Maps
pointing at  Pagasus (east of Milky Way)
SQM Sn #0814,  Average 5 reading.
20.38 2008-08-23
21:49 PDT
Clear Sky,   No Moon, Milky Way visible, B. & J. Sales
Location Corral at Latrobe Rd.
GPS DD.MM, 38° 31.610N, 121° 05.219W
Average 5 readings.  Clear sky, pointing to Zenith
SQM-L Sn #2752,  Average 5 reading.
20.45 2008-08-23
21:51PDT
Clear Sky,   No Moon, Milky Way visible, B. & J. Sales
Location Corral at Latrobe Rd.
GPS DD.MM, 38° 31.610N, 121° 05.219W
Average 5 readings.  Clear sky, pointing to Zenith
SQM Sn #0814,  Average 5 reading.
Doran Campground, Bodega Bay Google Maps --- 38.3136, -123.047  topozone map
 
 

Measurement anticipated
38.3136, -123.047
Eureka Sand Dunes, Death Valley Ca Google Maps --- 37.098696, -117.673146
21.88 2007-03-18 09:30:00  Zenith, clear, Don Pensack
Note from Unihedron SQM Database
Fort Jones, CA   Sis-Q Ranch   Google Maps --- 41.623303,-122.935295
Sis-Q Ranch,  16216 Quartz Valley Rd, Fort Jones, CA 96032
GPS DD.MM --- 41 37.393N,  122 56.106W
21.79 6/27/09  
23:15
Average 5 readings.  Clear sky, pointing at Arcturus (Bootes).
SQM Sn #2752, Bev Sales, Jack Sales
21.84 6/27/09  
23:15
Average 5 readings.  Clear sky, pointing at Arcturus (Bootes).
SQM Sn #0814, Bev Sales, Jack Sales
Garden Grove, Ca Google Maps --- 33.782572,  -117.955055
14.26 2005-11-16 06:00:00  Zenith, clear, Bob
Note from Unihedron SQM Database
17.56 2006-01-23 06:03:00  Zenith, clear, Bob
Note from Unihedron SQM Database
17.04 2006-03-03 01:00:00  Zenith, 10% cloud cover, Bob
Note from Unihedron SQM Database
Hesperia, CA   6700 Block  Maple Ave. GoogleMaps --- 34.373514,  -117.346687
19.46 10/17/08
7:25:00 
Zenith, Clear Sky,   No Moon, Milky Way (just) visible,
Drop Lens Cobra 1500ft away.
SQM Sn #0814,  Average of 5 reading.  Jack Sales
19.73 10/17/08
7:30:00 
Zenith, Clear Sky,   No Moon, Milky Way (just) visible,
Drop Lens Cobra 1500ft away.
SQM-L Sn #2752,  Average of 5 reading.  Bev Sales
19.73 10/18/08
7:30:00 
Zenith, Clear Sky,   No Moon, Milky Way (just) visible,
Drop Lens Cobra 1500ft away.
SQM Sn #0814,  Average of 13 reading.   Jack Sales
20.03 10/18/08
7:40:00 
Zenith, Clear Sky,   No Moon, Milky Way (just) visible,
Drop Lens Cobra 1500ft away.  
SQM-L Sn #2752,  Average of 10 reading.   Bev Sales
Joshua Tree Nat'l Park , Yucca Valley Ca Google Maps --- 34.022147,  -116.150594
21.67 2007-02-21
23:00:00 
Zenith, clear, Don Pensack
Note from Unihedron SQM Database
Kennedy Meadows, Yosemite NP, Ca GoogleMaps  -- 38.314109,  -119.735699
     Measurement anticipated
Lake Sonoma, Geyserville, CA. GoogleMaps   --- 38.72409,-123.00808
21.46 1/26/09
various times
Conditions:  "dry, cold, calm with fair to good seeing."
Steve Gottlieb
SQM-L Sn # ????
SQM-L reading of 21.35-21.40 and 21.47
Steve's Lake Sonoma Observing Report 1/26/09
Gleaned from TAC Observing Reports and Mailing List
TAC's Northern California Observing Sites List
21.47 1/26/09
22:00
Greg LaFlamme
SQM-L Sn # ????
"all three of our SQ meters got the same readings"...
Greg LaFlamme Lake Sonoma Observing Report 1/26/09
21.40 1/17/09
various times
Conditions:  calm, zero clouds, good transparency
Steve Gottlieb
SQM-L Sn # ????
Steve's Lake Sonoma Observing Report 1/17/09
Gleaned from TAC Observing Reports and Mailing List
TAC's Northern California Observing Sites List
21.35 10-25-08
23:00
Greg LaFlamme
"SQM readings increased from 21.12 to 21.35 then tapered
off to 21.26, plenty dark"
Greg LaFlamme Lake Sonoma Observing Report 10/25/08
Landers, CA   Goat Mountain   GMARS   GoogleMaps --- 34.319907,  -116.39299
21.22 2007-06-18 08:00:00  Nordgren
Note from Unihedron SQM Database
Goat Mountain Astronomical Research Station (GMARS)
Lodgepole Campground, Cisco Grove, Ca GoogleMaps  ---39.298473, -120.599284


Measurement anticipated
Expected Location = 39.29476, -120.59091
Mount Laguna Observatory, Ca. Google Maps -- 32.876839, -116.415564
21.58 2006-07-07 03:45:00  Zenith, clear, San Diego IDA
Note from Unihedron SQM Database
21.69 2006-06-19 23:30:00  Zenith, clear, San Diego IDA
Note from Unihedron SQM Database
21.50 2006-05-24 23:30:00  Zenith, clear, San Diego IDA
Note from Unihedron SQM Database
Mount Pinos, California GoogleMaps --- 34.813398, -119.126537
21.85 2007-03-18 09:30:00  Zenith, clear, Don Pensack
Note from Unihedron SQM Database
34° 48' 47" N  119° 07' 36" W
21.69 2006-05-01 09:00:00  Zenith, clear, Don Pensack
Note from Unihedron SQM Database
21.49 2005-09-03 08:00:00  Zenith, clear, Don Pensack
Note from Unihedron SQM Database
Ocean Cove Campground, Sonoma County, Ca. GoogleMaps --- 38.552151 -123.304507
21.13
08/07/08
23:20
Clear, No Moon, Milky Way visible,
Zenith / Cygnus, SQM-L Sn #2752, Jack Sales
GPS Location = 38.552151  -123.304507
21.33
08/07/08
23:24
Clear, No Moon, Milky Way visible,
Zenith / Cygnus, SQM-L Sn #2752, Jack Sales
21.58 08/07/08
23:27
Clear, No Moon, Milky Way visible,
Zenith, SQM Sn #0814, Jack Sales
21.63 08/07/08
23:35
Clear, No Moon, Milky Way visible,
Corona Borilasis, SQM-L Sn #2752, Jack Sales
21.49 08/07/08
23:40
Clear, No Moon, Milky Way visible,
East of Pegasus, SQM-L Sn #2752, Jack Sales
Orland, California Google Maps  --- 39.748097, -122.192216
20.54 2008-05-10
10:48:00
Zenith, clear, Keith Myers
Note from Unihedron SQM Database
Map Source,    39° 44′ 52″ N, 122° 11′ 32″ W
Palomar Observatory, California Google Maps --- 33.356744, -116.864533
21.17 2007-03-19 20:30:00  Zenith, clear, San Diego IDA
Note from Unihedron SQM Database
20.79 2007-03-12 20:45:00  Zenith, clear, San Diego IDA
Note from Unihedron SQM Database
South East of Reno,  Nevada
20.20 2006-03-01 11:58:00  Zenith, clear, GEmerson
Note from Unihedron SQM Database
Ridgewood Ranch, Mendocino County Ca Google Maps --- 39.309826, -123.304936
21.42
6/24/07
03:00
Clear, No Moon, Milky Way visible,
Golden Rule RV Park south of space 129
SQM Sn #0814
Google Maps Location = 39.309826, -123.304936
Shingletown Airport,  Shingletown Ca Google Maps -- 40.521776, -121.816943
21.61
7/12/07
21:00
Some Clouds,   No Moon  Jack Sales, Class 3 Bortle
2007 Shingletown Star Party
SQM Sn #0814
GPS Location = 40°  31.28N,  121° 49.04W
Google Maps Location = 40.521776, -121.816943
21.63 7/13/07
22:27
Clear Sky,   No Moon  Jack Sales, Class 3 Bortle
2007 Shingletown Star Party
SQM Sn #0814
21.50 7/13/07
23:15
Some Clouds,   No Moon,  Jack Sales, Class 3 Bortle
2007 Shingletown Star Party
SQM Sn #0814
21.72 7/13/07
23:44
Clear Sky,   No Moon  Jack Sales, Class 3 Bortle
2007 Shingletown Star Party
SQM Sn #0814
21.68 2007-07-14
 07:30:00 
Zenith, clear, Shingletown CA Star Party airstrip ( markfol )
Note from Unihedron SQM Database
21.57 2007-07-14
 07:10:00 
10% cloud cover, markfol
Note from Unihedron SQM Database
Sugar Pine Camp Ground, Foresthill, Ca. Google Maps -- 39.136011, -120.794619


Measurement anticipated
Sugar Pine Camp Ground, Boat Ramp Parking Area Google Maps Location =  39.130327, -120.790429


Measurement anticipated
Tierra Del Sol, Ca. Google Maps Location =  32.621665, -116.321161
21.47 2007-06-08 00:45:00  Zenith, clear, San Diego IDA
Note from Unihedron SQM Database
21.46 2006-01-08 03:30:00  Zenith, clear, San Diego IDA
Note from Unihedron SQM Database
Union Valley Reservoir   Google Maps  Location =  38.82794,-120.35471 (General Location)
21.8 Unknown IHOP Observing Location Ice House Rd. 38.79222, -120.39583
Alvin Huey
Gleaned from TAC Observing Reports and Mailing List
TAC's Northern California Observing Sites List
Yosemite National Park., Ca Google Maps Location =  37.745641, -119.584551
21.98 2006-05-31 00:45:00  Zenith, clear, San Diego IDA
Note from Unihedron SQM Database
NOTE:  Times are local 24 hr. time and NOT Universal Time, SQM Database times are not consistent.



Great World Wide Star Count    This international event encourages everyone to go outside, look skywards after dark, count the stars they see in certain constellations, and report what they see online.  This Windows to the Universe Citizen Science Event is designed to encourage learning in astronomy!

Download the GWWSC Activity Guide    The Great World Wide Star Count is usually held during the fall October - November see the link above..


University Corporation for Atmospheric Research (UCAR)  The University Corporation for Atmospheric Research promotes partnership in a collaborative community dedicated to understanding the atmosphere—the air around us—and the interconnected processes that make up the Earth system, from the ocean floor to the Sun's core.

GLOBE at Night,  Participation in GLOBE at Night is open to anyone.    GLOBE (Global Learning and Observations to Benefit the Environment) is a worldwide hands-on, primary and secondary school-based education and science program.   More than half the people on Earth are expected to be living in cities.  Because of the ambient light of urban landscapes, many city dwellers have never seen a sky full of stars.   This is your chance do document Light Pollution in your area.

Sky Quality Meter Notes --
Unihedron Sky Quality Meter (SQM) - Makers of the Sky Quality Meter
Unihedron SQM Statistics (Database), CSV format file

The primary Sky Quality Meter STD (Sn #0814) with angular sensitivity of ~42°, used for this data set starting in early  September 2006.
A second Sky Quality Meter - L (Sn #2752) with angular sensitivity of ~10°, was used for this data set starting in early  September 2008.
Most geographic coordinates are taken with a Magellan eXplorist 100 portable handheld GPS unit or based on street addresses.
Coordinates were further refined using Google location corrdinates of DD.DDDDDD in the search box centered at pin point.

Introducing the Bortle Dark-Sky Scale, by Jeff Jeff Burton
The Bortle Dark-Sky Scale, (Sky and Telescope)
John Bortle's Dark Sky Scale, Frosty Drew Observatory

Ben Sugerman's Limiting Magnitude calculations page.

HOW DARK IS MY SKY?

Clear Sky Charts in California ,  Based on a numerical weather model, Clear Sky Charts are perhaps the most accurate and the most usable forecasters of astronomical observing conditions for over 1900 observatories and observing sites in North America and 305 in California.



TopoZone.Com  California Location Index

07 JUN 2009
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  • skykeepers.org/ca-skyquality.html