• ES Picture of the Day 08 2021

    From Black Panther@21:1/186 to All on Mon Feb 8 11:00:36 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.


    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

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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
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  • From Black Panther@21:1/186 to All on Fri Jan 8 11:00:50 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.


    Cracked Eggs of the Bisti Badlands

    January 08, 2021

    Cracked Eggs

    Photographer: Thomas McGuire
    Summary Author: Thomas McGuire

    As followers of Earth Science Picture of the Day have seen, the
    American West has some of the world's most spectacular features.
    Badlands are areas where active erosion of soft sediments has
    created a stark landscape largely devoid of vegetation. Rapid
    erosion hasn't allowed plants to take root and develop fertile
    soil. Badlands National Park in South Dakota and Petrified
    Forest National Park in Arizona are prime examples of badlands. The
    remote Bisti Badlands of northwest New Mexico are far less visited,
    but they contain a variety of unique geological features including
    hoodoos, arches, toadstools, petrified wood and other
    fossils. Not the least of which is a patch of weathered
    concretions known as the cracked eggs. A friend pointed out the
    similarity of the boulders on the left to the iconic drawing
    ( "Reptiles" by M.C.Esher) in which tessellations become
    animated. Photo taken February 28, 2017.
    * Bisti/De-Na-Zin Wilderness, New Mexico Coordinates: 36.2921,
    -108.12978

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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 3 weeks, 2 days, 21 hours, 27 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Mon Mar 8 11:00:40 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.


    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

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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 11 weeks, 5 days, 21 hours, 27 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Thu Apr 8 11:00:54 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.


    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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    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
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  • From Black Panther@21:1/186 to All on Tue Jun 8 11:00:36 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.


    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



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    Geography Links

    * Atlapedia Online
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    * Holt Rinehart Winston World Atlas
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    * 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

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  • From Black Panther@21:1/186 to All on Thu Jul 8 11:00:26 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.


    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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    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
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  • From Black Panther@21:1/186 to All on Sun Aug 8 11:00:30 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.


    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
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    * 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)
  • From Black Panther@21:1/186 to All on Wed Sep 8 11:00:30 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.


    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

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    -
    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
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  • From Black Panther@21:1/186 to All on Fri Oct 8 11:00:38 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.


    Lunar Corona Above the Rocca del Brunelleschi

    October 08, 2021

    VIcopisano-con-Luna-FINALE

    Photographer: Marco Meniero

    Summary Author: Marco Meniero; Jim Foster

    Featured above is a charming lunar corona as observed above the
    Rocca del Brunelleschi in Tuscany, Italy, on the night of July 12,
    2021. Coronas consist of two or more concentric, pastel-colored rings.
    The central bright area is called the aureole, which has the
    appearance of a bluish-white disk that fades to reddish-brown towards
    the edge. Note that the aureole is sometimes the only visible portion
    of a lunar or solar corona. Diffraction of moonlight by minute
    water droplets that compose mid-level clouds is responsible for the
    formation of coronas.

    The Rocca del Brunelleschi and its renowned tower was commissioned
    to the architect Filippo Brunelleschi in 1434 when the village of
    Vicopisano, where the tower now stands, was successfully defended
    after being besieged for eight months by the Florentines.

    Photo details: Eos 1DXMK2 camera; Sigma 105; f/1.4.
    * Vicopisano, Tuscany, Italy Coordinates: 43.6991, 10.5831

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    Atmospheric Effects Links

    * Atmospheric Optics
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    * 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 5 weeks, 21 hours, 55 minutes
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  • From Black Panther@21:1/186 to All on Mon Nov 8 11:00:28 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.


    Patterns Created by a Water Strider

    November 08, 2021

    6M2A3053p

    Photographer: Bertrand Kulik

    Summary Authors: Bertrand Kulik; Jim Foster

    The curious wave pattern featured above was made on a small stream by a
    water strider, at center. The contrast between light and dark is so
    strong here because the photo was snapped in bright sunlight. Thanks to
    surface tension, a strider’s (also known as water spiders, or pond
    skaters) long, thin legs and micro hairs, over its entire body, enable
    it to “ walk” over the water’s surface. Note that where its legs
    touch the water, minute depressions are formed on the surface that act
    as miniature mirrors.

    Can you see the smiley face? Photo taken from l’Evêque, Burgundy,
    France on August 29, 2021.

    Photo details: Canon EOS 5D Mark III camera; EF100-400 mm;
    f/4.5-5.6L IS II USM +1.4x III; ƒ/8.0; 560.0 mm; 1/8000 sec. exposure;
    50 ISO.
    * l’Evêque, Burgundy, France Coordinates: 47.7201, 3.5473

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    Animal Links

    * Animal Diversity Web
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    * Bug Guide
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    * Integrated Taxonomic Information System
    * Microbial Life Resources
    Earth Science Picture of the Day is a service of the
    -
    Universities Space Research Association.

    https://epod.usra.edu

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  • From Black Panther@21:1/186 to All on Wed Dec 8 11:00:32 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.


    Shelf Cloud and Squall Line Approaching Syracuse, Italy

    December 08, 2021

    Squall-line

    Photographer: Barbara Pindo

    Summary Author: Barbara Pindo; Cadan Cummings

    The photo above shows a shelf cloud that formed on the leading side
    of a squall line, also known as a Groppo line, near the city of
    Syracuse, Italy. This distinct cloud formation was visible over the
    city in the afternoon on May 10, 2021 and appeared as a long, narrow
    band of strong storms that continually regenerated. Squall-line
    formations can at times be 60 to over 180 miles (100 to 300 km) long
    and often precede severe weather. These events develop on the
    separation line between warm, humid air present on the ground, and
    colder, heavier air in the atmosphere that is being pushed by a
    cold front. The cold, dry air raises the warm, humid air forming a
    series of cumulonimbus clouds parallel to the advancing front.
    At the transition of a Groppo Line, there are several weather
    conditions that often occur together or in succession. Initially very
    strong wind-- just as what was experienced in Syracuse-- develops and
    precedes heavy rain or mixed rain/ hail and an ensuing area of lighter
    rain from stratiform clouds. Prior to this event, I had not seen
    this phenomenon before but luckily I was able to capture it in this
    panoramic photo.

    Photo details: Canon Eos 1100D; Focal length 18.00 mm; Exposure 1/200
    sec; f/3.5; ISO-200. Five photos combined into a single panoramic
    photo.
    * Syracuse, Sicily, Italy Coordinates: 37.0755, 15.2866

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    Cloud Links

    * Atmospheric Optics
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    * Cloud Atlas
    * Color and Light in Nature

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

    https://epod.usra.edu

    --- up 3 days, 20 hours, 43 minutes
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