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From: Dan Richter (1:317/3)
To: All
Date: Wed, 12.05.21 13:00
ES Picture of the Day 12 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.

Omega Sun over South Padre Island, Texas

May 12, 2021

Omega Sunset

Photographer: Ce'sar Cantu'
Summary Authors: Ce'sar Cantu'; Jim Foster
The photo above was captured at sunset over the Gulf of Mexico, as
viewed from South Padre Island, Texas. Because of strong
atmospheric refraction the solar disk takes the shape of the Greek
letter omega.

At sunset or sunrise, sunlight directed towards us from the lower
portion of the Sun passes through a somewhat denser atmosphere than
rays coming from the Sun’s upper limb. Consequently, the bottom of the
solar disk is refracted more, and thus distorted more, than the top
of the solar disk. The omega shape (also known as Etruscan vase)
actually results from an inferior mirage. When the Sun drops beneath
the horizon, its inferior mirage seems to connect with the true

A wind turbine for generating electric power is in the foreground.
Photo taken on March 6, 2021.

South Padre Island, Texas Coordinates: 26.1118, -97.1681

Related EPODs

Omega Sun over South Padre Island, Texas Circular Rainbow
Viewed from the Tower of Viterbo Airport, Italy 22 Degree Halo
Observed from Melbourne, Florida Sunrise and Cloud Mirages Observed
from Monte Tomba, Italy Views of Sahara Dust over the Canary
Islands (Spain) and Paris, France Cloud Corona Above 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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