Top Sell
-
NAS 412 Rev. 2
Original price was: $99.00.$59.00Current price is: $59.00.
-
JIS K 6386:2019
Original price was: $20.00.$11.00Current price is: $11.00.
-
Total Welding Management
Original price was: $54.00.$32.00Current price is: $32.00.
-
NAS 4003 Rev. 13
Original price was: $69.00.$41.00Current price is: $41.00.
-
AASHTO Green Book (GDHS-7)
Original price was: $310.00.$186.00Current price is: $186.00.
LIGHTING REQUIREMENTS NEAR ASTRONOMICAL OBSERVATORIES (PO97, 1151-1156)
Original price was: $22.00.$13.00Current price is: $13.00.
Conference Proceeding by Commission Internationale de L'Eclairage, 10/23/2017
Nearly all astronomy at visible wavelengths involves the study of very faint objects in the night sky. Astronomy is therefore extremely vulnerable to the impact of artificial light, which can produce skyglow, making the night sky brighter. Artificial light can travel enormous distances in Earth?s atmosphere, limited only by the curvature of the Earth. Astronomical observatories must therefore be carefully protected by lighting regulations that extend for distances up to 300 km from the observatory. Astronomy is particularly vulnerable to blue light, which is becoming more common due to widespread use of LEDs. The methods being used to protect the major astronomical observatories in Hawaii will be described.
Product Details
- Published:
- 10/23/2017
- Number of Pages:
- 7
- File Size:
- 1 file , 440 KB
