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.


An Unusual Arch

February 08, 2021

ARCH

Photographer: Stan Wagon
Summary Author: Stan Wagon

There are many different types of geologic arch. Shown above is a
waterfall arch, which directly contradicts the classic arch
definition of a curved structure that gains strength from the curve.
Uniquely, this one consists of a straight row of discrete cubic forms
and has had enough strength to stand for perhaps ten thousand years.
This particular cobblestone structure is made of Salt Wash
Sandstone, part of the Morrison formation and is located in
Arches National Park. Photo taken April 22, 2018.

Photo Details: Camera: SONY ILCE-6500; Software: Adobe Photoshop
Elements 13.0 (Macintosh); Lens: E 16-70mm F4 ZA OSS; Exposure Time:
0.0016s (1/640); Aperture: ƒ/20.0; ISO equivalent: 800; Focal Length
(35mm): 24
* Arches National Park, Utah Coordinates: 38.61753, -109.61762

Related EPODs

An Unusual Arch Cerro Ventana, Argentina Mount Forato’s
Natural Arch at Sunset The Stone Donkey Archive - Black Hills
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Geology Links

* Earthquakes
* Geologic Time
* Geomagnetism
* General Dictionary of Geology
* Mineral and Locality Database
* Mohs Scale of Mineral Hardness
* This Dynamic Earth
* USGS
* USGS Ask a Geologist
* USGS/NPS Geologic Glossary
* USGS Volcano Hazards Program

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

https://epod.usra.edu

--- up 7 weeks, 5 days, 21 hours, 27 minutes
* Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)

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.


Caldera de Taburiente National Park, Spain

March 08, 2021

Capture

Photographer: Ana García Suárez
Summary Authors: Ana García Suárez; Stu Witmer

Seen above are the rugged snow-covered peaks and the valleys of the
Caldera de Taburiente National Park in the Canary Islands of
Spain. La Palma island is composed of two large volcanic centers.
The older northern center is cut by the massive steep-walled
Caldera Taburiente. About 560,000 years ago, this ridge was
partially destroyed by a huge lateral collapse which formed the rugged
landscape we see today. Photo taken at sunset on January 10, 2021.
* Caldera de Taburiente National Park, Spain Coordinates:
28.74333, -17.87201

Related EPODs

Caldera de Taburiente National Park, Spain Opalescent Fossil
Shells A Conglomeration of Witches and Wonders Horn Park Quarry
Ammonites An Unusual Arch Cerro Ventana, Argentina
More...

Geology Links

* Earthquakes
* Geologic Time
* Geomagnetism
* General Dictionary of Geology
* Mineral and Locality Database
* Mohs Scale of Mineral Hardness
* This Dynamic Earth
* USGS
* USGS Ask a Geologist
* USGS/NPS Geologic Glossary
* USGS Volcano Hazards Program

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

https://epod.usra.edu

--- up 11 weeks, 5 days, 21 hours, 27 minutes
* Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)

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.


Cloud Corona Above Syracuse, Italy

April 08, 2021

Diurnal Nebulae or Iridescence Clouds LD

Photographer: Dario Giannobile
Summary Authors: Dario Giannobile; Jim Foster

The photo above shows the lovely, pastel colors I noticed in the
western sky before sunset, near my home in Syracuse, (Sicily) Italy. It
was taken on February 13, 2021. These colors aren’t associated with
sunset or twilight, however. Rather they result from the
diffraction of sunlight by tiny, uniform-sized droplets that
compose mid-level clouds that happen to be in the vicinity of
the Sun. This is a cloud corona. Its colors, filaments and
structure resemble nebula I sometimes see when peering through my
telescope.

Photo Details: Canon 6d camera; Sigma 150-600 lens; f/11; ISO 100;
1/3200 second exposure.
* Syracuse, Italy Coordinates: 37.0755, 15.2866

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Cloud Corona Above Syracuse, Italy Sunrise from the Roque de
Los Muchachos Astrophysical Observatory Lunar Mirage and Cruise
Ship Solar Halo and Lunar Halo Observed from Zsámbék, Hungary
Double Rainbow on Evia, Greece Twilight from Mount Penteli,
Greece
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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.

https://epod.usra.edu

--- up 1 week, 6 days, 22 hours, 10 minutes
* Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)

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.


Gebel Kamil Meteorite and Kamil Impact Crater

June 08, 2021

Mila_meteorite

Image (1)

Photographer: Mila Zinkova

Summary Author: Mila Zinkova


Shown above, at top, is a piece of the Gebal Kamil iron
meteorite found at the Kamil Impact Crater in Egypt. According to
geologists this approximately 2 in (5 cm) specimen formed less than
5,000 years ago. The 147-ft-wide, 52-ft-deep (45-m-wide, 16-m-deep)
crater was actually first identified during a Google Earth survey
in 2008 (bottom image). Note the interesting ray structure (splatter
pattern of impact ejecta) surrounding the blast site that was
created as the meteorite exploded. Egypt's arid climate has allowed
thousands of small iron meteorites to survive in a relatively good
condition. Top photo taken on April 19, 2021.



Kamil Impact Crater, Egypt Coordinates: 22.0183, 26.0877



Related EPODs

Gebel Kamil Meteorite and Kamil Impact Crater Geodiversity atop
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Geography Links

* Atlapedia Online
* CountryReports
* GPS Visualizer
* Holt Rinehart Winston World Atlas
* Mapping Our World
* Perry-Castañeda Library Map Collection
* Types of Land
* World Mapper

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

https://epod.usra.edu

--- up 4 weeks, 4 days, 12 hours, 15 minutes
* Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)

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.


Rock Run Conglomerate

July 08, 2021

Conglomerate

Photographer: Joshua Milden

Summary Author: Joshua Milden & Cadan Cummings

Found on the stream bed of Rock Run near Ralston, PA, this
sample of conglomerate consists of well-rounded quartz and
plagioclase feldspar clasts. Conglomerate is a sedimentary
rock composed of small rock granules (~ 0.08 in or 2 mm) cemented
together by a blend of calcium carbonate, iron oxide, and silica.
Typically, a mixture of sand, silt, and clay fills the airspace
between the rounded rocks. If the rock sample consists of angular,
broken granules fragments it is instead called a breccia. The
pictured conglomerate sample measures about 2 in (5 cm) thick and 5 in
(13 cm) long.

Rock Run is in the McIntyre Wild Area and features many beautiful
natural streams and waterfalls. The stream is a tributary to
Lycoming Creek and is fed by Baumunk Lake.

Photo data: LG Stylo 5 rear camera. ISO 50, automatic WB, focal length
3.159 mm, exposure time 1/40 sec
* Ralston, PA Coordinates: 41.507028, -76.953806

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of Stone
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Geology Links

* Earthquakes
* Geologic Time
* Geomagnetism
* General Dictionary of Geology
* Mineral and Locality Database
* Mohs Scale of Mineral Hardness
* This Dynamic Earth
* USGS
* USGS Ask a Geologist
* USGS/NPS Geologic Glossary
* USGS Volcano Hazards Program

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

https://epod.usra.edu

--- up 8 weeks, 6 days, 12 hours, 15 minutes
* Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)

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.


Archive - Star Trails Above Pemaquid Point Lighthouse, Bristol, Maine

August 07, 2021

6a0105371bb32c970b017d3e2d14f7970c-750wi

Each weekend we present a notable item from our archives. This EPOD
featuring a lighthouse for this weekend's Lighthouse Day was
originally published December 1, 2012.

Photographer: John Stetson
Summary Author: John Stetson
The photo above showing the Pemaquid Point Lighthouse and trails of
overhead stars was captured just before dawn in Bristol, Maine on
October 23, 2012. The camera was facing east. Venus is the
brightest trail, rising from the Gulf of Maine. At the latitude of
the Pemaquid Point Lighthouse, approximately 44 degrees north, all
stars having a declination greater than 46 degrees (stars at the
top left of the photo) would be circumpolar -- they never rise and
set but are above the horizon throughout the year. Said in another way,
at a latitude of 44 degrees any star will be circumpolar if it's less
than 44 degrees from the north celestial pole. At the North
Pole, all of the stars in the sky are circumpolar. Note that the
Tiangong-1 satellite appears as an arc perpendicular to the star
trails above the lighthouse.
* Pemaquid Point Lighthouse, Bristol, Maine Coordinates: 43.8369528,
-69.5060472

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Night Sky Links

* Space Weather Live
* Space Weather Live Forum
* About the Moon
* American Meteor Society
* Arbeitskreises Meteore e.V.
* Global City Lights
* Heavens Above Home Page
* The International Meteor Organization
* Lunar and Planetary Institute
* MoonConnection
* NASA Eclipse Web Page
* Understanding The Moon Phases

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

https://epod.usra.edu

--- up 13 weeks, 2 days, 12 hours, 15 minutes
* Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)

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.


Earth’s Rotation and Revolution

September 08, 2021

Ormefoto - eq sol

Photographer: Orazio Mezzio

Summary Author: Orazio Mezzio

The image above shows a composite photo shot during the vernal
equinox (March 20, 2020) and the summer solstice (June 21, 2021).
The Earth experiences two types of motion, namely rotation and
revolution. Rotation is defined as the spinning motion of an object
about its axis. Earth rotates around its axis once per day,
which causes each day to be 24-hour long. Conversely, revolution is the
motion of an object around another object. In the case of Earth, it
revolves around the Sun once per year, thus producing the 365-day
year.

On the left of the image above, the apparent path of the setting
sun (rotation) is shown on the day of the vernal equinox (revolution).
During the golden hour, the sky fills with warm colors (rotation).
On the right side of the image, the crepuscular rays on the day of
the summer solstice (revolution) are clearly visible. It is the
blue hour and the sun is far enough below the horizon that only the
blue, colder light of the sunset is visible (rotation).

Photo Details: Equinox: Nikon D750; Ob., Nikkor 105mm; Exposure Time:
Sun 14 frames, 1/4000 sec – f/29 – iso 100; Church 2 frames, 1/640 sec
– f/6.3 – iso 100. Photoshop CC. Image Date: March 20, 2020 ; Solstice:
Nikon D750; ob. Signa art 20mm; 1/80 sec. - f/4.5 – iso 100. Image Date
June 21, 2021.
* Sortino, Italy Coordinates: 37.156667, 15.025833

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Sun Links

* NASA Solar Dynamics Observatory
* NASA Solar Eclipse Page
* NOAA Solar Calculator
* The Sun-Earth Connection: Heliophysics
* The Sunspot Cycle
* Solar System Exploration: The Sun
* The Sun Now
* This Week’s Sky

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

https://epod.usra.edu

--- up 5 days, 21 hours, 55 minutes
* Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)