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From: Dan Richter (1:317/3)
To: All
Date: Mon, 15.03.21 13:00
ES Picture of the Day 15 2021
EPOD - a service of USRA

The Earth Science Picture of the Day (EPOD) highlights the diverse processes
and phenomena which shape our planet and our lives. EPOD will collect and
archive photos, imagery, graphics, and artwork with short explanatory
captions and links exemplifying features within the Earth system. The
community is invited to contribute digital imagery, short captions and
relevant links.

Twilight from Mount Penteli, Greece

March 15, 2021


Photographer: Konstantinos Christodoulopoulos
Summary Author: Konstantinos Christodoulopoulos; Jim Foster

Shown above is the captivating twilight sky I observed several
weeks ago from Mount Penteli in the Attica region of Greece.
Its summit, known as Pyrgari, has an elevation of 3,638 ft (1,109 m).
These rich, marigold colors occurred during the transition from
civil to nautical twilight. When the Sun’s below the horizon, the
indigo and blue colors are scattered from view by the increased
path-length of sunlight, but the longer wavelength colors (yellows,
oranges and reds) remain until nightfall. Photo taken on December 25,
Photo Details: Canon EF camera; 24 mm; f/3.5; USM lens; 2-second
exposure; ISO 200; Digipod A 2541P Tripod; Manfrotto 496 RC2 Ball Head.
* Mount Penteli, Greece Coordinates: 38.0667, 23.8833

Related EPODs

Twilight from Mount Penteli, Greece Upper Tangent Arc and Sun
Pillar Above Orsta, Norway Val-d'Ise're Moonbow Green Flash
Sequence Observed from Civitavecchia, Italy Lunar Corona over
Pistoia, Italy Inferior Mirage Observed from Plemmirio, Syracuse,

Atmospheric Effects Links

* Atmospheric Optics
* Color and Light in Nature
* The Colors of Twillight and Sunset
* Refraction Index
* Image Gallery: Atmospheric Effects
* What is a Rainbow?

Earth Science Picture of the Day is a service of the Universities
Space Research Association.

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