What is it about?

The daylight climate of Athens, Greece is presented in this work. The term "daylight climate" reflects the variations and trends of the daylight levels in a long period of time (in this case 1992-2017, 26 years).

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Why is it important?

The study shows that the variations and trends in the daylight levels follow those of the solar irradiance. Since the period after 1990 has been characterised as the "brightening effect" (recovery of the solar irradiance levels in the western world at least), the same conclusion is drawn for daylight. The study is the first worldwide to show such a recovery in the daylight levels after 1990.

Perspectives

The findings of this study may trigger the interest of other scientists working in the field of daylight in order to investigate the "brightening effect" of daylight in other parts of the world. This is in contrast to the many studies that have extensively examined this effect of solar radiation.

Harry Kambezidis
National Observatory of Athens

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This page is a summary of: The daylight climate of Athens: Variations and tendencies in the period 1992–2017, the brightening era, Lighting Research & Technology, March 2019, SAGE Publications, DOI: 10.1177/1477153519837697.
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