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La Palma sky-brightness calculator



Solar activity (0 - 1):

Enter a value between 0 (solar minimum) and 1 (solar maximum). The evolution of the current solar cycle can be seen on this NOAA page. Recent solar minima were in 1976.8, 1986.8, 1996.5, 2009.0, next is due ~ 2020.

Ecliptic latitude (deg): Galactic latitude (deg) :

(Enter ecliptic and galactic latitudes in the range 0 - 90.)

Airmass (1.0 for zenith):

Phase angle of moon :
0 = full, 90 = 7-day-old moon, 180 = new moon, -1 for no moon

Zenith distance of moon [that of target area is given by airmass] (deg) :

Angular distance from moon (deg) :

Extinction (mag/airmass) :



© Isaac Newton Group of Telescopes
Developed by Chris Benn


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Contact:  (WHT Manager)
Last modified: 24 April 2018