Abstract
ABSTRACT The absolute spectral energy distributions of the night sky at Palomar and Mount Wilson Observatories have been obtained by means of photoelectric spectrophotometry. Measurements made on a number of dates are discussed and compared. The average sky brightuess at Palomar, still a relatively dark site, shows no very significant long-term changes over the period 1969-73. The average brightness in the continuum at 5400 A is AB 22 magnitudes per square arc second. The overall sky brightness at Mount Wilson is typically close to two magnitudes brighter than at Palomar, and the artificial mercury emission-line intensities are up to 30 times stronger than at Palomar. Key words: sky brightness - absolute spectral energy distribution
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