• ES Picture of the Day 16 2020

    From Black Panther@21:1/186 to All on Thu Jan 16 14:01:06 2020
    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.


    Paraselene and Pooch

    January 16, 2020

    Paraselene l

    Photographer: Marcella Giulia Pace
    Summary Authors: Marcella Giulia Pace; Jim Foster

    Shown above is the waning gibbous Moon as observed over the
    Modica countryside of Sicily, Italy on the night of December 15,
    2019. At right center is a parselene or moon dog. Although
    22-degree lunar halos are commonly seen when the Moon is in the
    gibbous and full phases, other halos features, such as moon dogs
    are rarely noticed since the MoonΓÇÖs light is too feeble to make
    them as conspicuous as their daytime counterparts ( sundogs).
    TheyΓÇÖre formed when moonlight moves through oriented, hexagonal,
    plate-shaped ice crystals. These crystals are either
    free-falling in the atmosphere or more likely, contained in
    cirrus clouds. As moonlight enters one of the crystalsΓÇÖ side faces
    itΓÇÖs bent by approximately 22 degrees before exiting an alternate face.
    Thus, theyΓÇÖre seen 22 degrees away from the Moon and also at the same
    altitude as the Moon

    Moon dogs can only be seen when the MoonΓÇÖs not too high up in the sky
    (below 61 degrees above the horizon or 29 degrees from the zenith). As
    can be seen at bottom center, these moon dogs arenΓÇÖt the only dogs
    visible on this photo. My pooch made an unexpected appearance as I
    snapped the shutter.

    Photo Details: Camera: NIKON D7100; Software: Adobe Photoshop CC 2014
    (Macintosh); Exposure Time: 30.000s; Aperture: ƒ/2.8; ISO equivalent:
    100; Focal Length (35mm): 16; Lens: Tokina AT-X 116 PRO DX 11-16mm
    F2.8.
    * Modica, Italy Coordinates: 36.85, 14.766667

    Related EPODs

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    More...

    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 6 weeks, 5 days, 14 hours, 54 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Sun Feb 16 14:01:20 2020
    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 - Petrified Forest of Theodore Roosevelt National Park

    February 16, 2020

    Petrified Wood 4367 (2)
    Each Sunday we present a notable item from our archives. This EPOD was
    originally published February 2, 2014.

    Photographer: George Seielstad
    Summary Authors: George Seielstad
    Shown above is an example of petrified wood found in Theodore
    Roosevelt National Park (South Unit), North Dakota. What is today a
    dry, sparsely forested region of so-called badlands once had an
    abundance of dawn redwood trees ( Metasequoia glyptostroboides).
    In order for their petrifaction to have occurred, fallen trees must
    have been buried rapidly, most likely by a flooding river. Between that
    ancient event and now, these trees spent several thousand years buried
    beneath hundreds of feet of glacial ice. One of the attractions of
    the South Unit of Theodore Roosevelt National Park is that itΓÇÖs never
    crowded. On the day this photo was snapped, September 6, 2013, I didnΓÇÖt
    see a single person the entire afternoon.
    Photo Details: Nikon D300 camera; Nikkormat 28-70 mm lens; at 34 mm (51
    mm equivalent); f/20; 0.01 sec. exposure; ISO 400; handheld; Software:
    Adobe Photoshop Elements 9.0 Windows.
    * Theodore Roosevelt National Park-South Unit, North Dakota
    Coordinates: 46.966667, -103.45

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    Portugal
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    Geography Links

    * Atlapedia Online
    * CountryReports
    * GPS Visualizer
    * Holt Rinehart Winston World Atlas
    * Mapping Our World
    * Perry-Casta├▒eda 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 3 weeks, 4 days, 15 hours, 5 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Mon Mar 16 13:01:36 2020
    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.


    Yosemite Falls in Winter

    March 16, 2020

    2020 February 8 - a2 Yosemite NP Upper Yosemite Falls Trail Upper
    Yosemite Falls 2

    Photographer: Cindy Todd
    Summary Author: Cindy Todd

    Shown above is a view of the Upper Yosemite Falls, in Yosemite
    National Park, California. The Yosemite Falls Trail is
    approximately 7.2 miles (11.6 km), round trip, with an elevation gain
    of nearly 2,700 feet (823 m), according to the National Park
    Service.

    It's a strenuous hike that should be started before sunrise. Since
    itΓÇÖs winter, I started my hike at 6:30 a.m. and was able to do the
    entire trip in 4.5 hours. The trail is so steep in some areas that
    youΓÇÖre hiking on your toes. My calves were still very sore a few days
    afterward.

    The views from the trail of the valley, Half Dome, North Dome,
    etc. are amazing. As a bonus, Upper Yosemite Falls had snow and ice
    at its base. So, as water plunged down upon the ice, you'd hear loud
    cracking and booming sounds. What an experience! This trail should be
    on every experienced hiker's to-do list. Photo taken on February 8,
    2020.

    Photo Details: Camera: NIKON COOLPIX L610; Exposure Time: 0.033s
    (1/30); Aperture: ƒ/3.5; ISO equivalent: 200; Focal Length (35mm): 28.
    * Yosemite Falls, California Coordinates: 37.75705, -119.59666

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    Geography Links

    * Atlapedia Online
    * CountryReports
    * GPS Visualizer
    * Holt Rinehart Winston World Atlas
    * Mapping Our World
    * Perry-Casta├▒eda 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 7 weeks, 5 days, 14 hours, 5 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Thu Apr 16 13:01:54 2020
    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.


    Rocca del Corno and Roman Bridge

    April 16, 2020

    Val Ponci (1)

    Photographer: Piero Armando
    Summary Author: Piero Armando

    Limestone rock is widespread around the town of Finale Ligure,
    in the Italian region of Liguria. This rock, after millions of
    years of erosion, has formed a familiar karst landscape, that
    includes cliffs (like Rocca del Corno, pictured above at top) and
    caves, some of which have been inhabited since prehistoric times.

    In the Ponci Valley, it’s still possible to visit the 5 Roman
    bridges (bottom photo) of Via Julia Augusta, a Roman consular
    road constructed in 13 BC, under the reign of Emperor Augustus.
    This road completed the link between Rome and the southern coast of
    Gaul. Photo taken on February 24, 2020.

    Photo Details: Canon EOS 600D camera; ISO 400; 1/100 sec exposure;
    70-25 mm focal length; f/7.1.
    * Finale Ligure, Italy Coordinates: 44.1689, 8.3416

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    - Tutukaka Coast From Frying Pan Corner Lookout Differential
    Erosion on Ice Path of the Sun on the Days of the Equinox and
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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 12 weeks, 1 day, 14 hours, 5 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Sat May 16 15:01:50 2020
    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.


    Encore - Four Rainbows Over Banks Lake, Washington

    May 16, 2020

    Quadruple Rainbow Small
    Today and every Saturday Earth Science Picture of the Day invites you
    to rediscover favorites from the past. Saturday posts feature an EPOD
    that was chosen by viewers like you in our monthly Viewers' Choice
    polls. Join us as we look back at these intriguing and captivating
    images.

    Photographer: Robert Orleth
    Summary Authors: Robert Orleth; Jim Foster
    July 2014 Viewer's Choice The photo above shows three obvious
    rainbows over Banks Lake in Washington State. It was taken a little
    before sunset on June 18, 2014. The bright primary rainbow is at
    left and its secondary rainbow is at right. In the middle is the
    primary's reflected bow, standing nearly vertical. In this case,
    the third bow isn't a result of a third reflection of sunlight within
    raindrops, rather it's due to the reflection of sunlight off of
    Banks Lake, then being refracted in the raindrops. You can tell that
    it's a reflection because the color scheme (blue on inside, red on
    outside) is the same for both the primary and reflected bows. Note that
    if you look very closely you can detect a fourth rainbow. The reflected
    bow has a very faint secondary bow as well -- just to the right of the
    major secondary bow.

    Photo Details: Camera: Canon PowerShot G11; Focal Length: 6.1mm;
    Aperture: f/4.0; Exposure Time: 0.017 s (1/60); ISO equiv: 80.
    * Banks Lake, Washington Coordinates: 47.6200, -119.3075

    Related EPODs

    Encore - Four Rainbows Over Banks Lake, Washington Singular
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    More...

    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 16 weeks, 3 days, 16 hours, 5 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Tue Jun 16 15:00:28 2020
    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.


    Sapphire Cove and Approaching Storm

    June 16, 2020

    DSC9802REDCT

    Photographer: Kevin Saragozza
    Summary Author: Kevin Saragozza

    The photo above was taken near my villa in Plemmirio, (Italy) on the
    afternoon of April 23, 2020. The huge boulders and rocky cliffs protect
    Sapphire Cove from the Mediterranean Sea. This charming natural
    cove is one of many found along the coast of southeastern Sicily.

    That’s me in the background observing the sky, in particular,
    approaching storm clouds -- cumulonimbus capillatus. Not long after
    this photo was snapped, these mature storm clouds ushered in strong
    winds and heavy rain, enough to cause local flooding.

    Photo Details: Sonya7iii camera; mc 11; Canon 16 35; f4. This photo was
    made by merging several shots in HDR after the final files were merged
    to generate the overview; later the file was post-produced with
    Photoshop.
    * Plemmirio, Italy Coordinates: 37.0054, 15.3175

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    More...

    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 20 weeks, 6 days, 16 hours, 4 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Thu Jul 16 15:00:28 2020
    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.


    Spray Droplets and Rainbow Colors

    July 16, 2020

    Light drops EPOD

    Photographer: Dario Giannobile
    Summary Author: Dario Giannobile
    Rainbows are caused by reflection, refraction and dispersion of
    sunlight by water drops and droplets, resulting in a strip of
    spectral colors across the sky, taking the form of a circular
    arc. You can also see rainbows near fountains and waterfalls, as in the
    case above. Here the effect has been captured over a small waterfall in
    the valley of Pantalica ( UNESCO World Heritage site). To obtain
    this photo I used a telephoto lens with a very short depth of
    field, so that the spray droplets are out of focus, but at the same
    time are reflecting the colors of the rainbow. See yesterday's
    Earth Science Picture of the Day. Photo taken on April 14, 2013.

    Photo Details: Camera - Canon EOS 7D; Software - Adobe Photoshop 21.1
    (Windows); Exposure Time - 0.0003s (1/3200); Aperture - ƒ/3.2; ISO
    equivalent - 800; Focal Length - 200.0mm.
    * Pantalica, Italy Coordinates: 37.1415, 15.0297

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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 15 hours, 25 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Sun Aug 16 15:00:26 2020
    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 - Hawaiian Rainbow

    August 16, 2020

    Rainbow3

    Each Sunday we present a notable item from our archives. This EPOD was
    originally published August 16, 2003.

    Provided and copyright by: John Sperduto
    Summary author: John Sperduto

    While walking west along Sunset Beach on Oahu, Hawaii, I encountered a
    brief rain shower about an hour before sunset. After it passed, the Sun
    came out, and as I turned to see if a rainbow was present, this
    exquisite bow greeted me -- the biggest rainbow I've ever seen. A
    second rainbow is also visible (top left). This secondary rainbow is
    created when the Sun's light is twice reflected in raindrops, and the
    rays exit the drops at an angle of 51 degrees. For the primary rainbow,
    the light emerges at an angle of 42 degrees. Note that with the
    secondary rainbow, the red band is on the inside, the reverse of the
    primary bow.


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    More...

    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 4 weeks, 3 days, 15 hours, 25 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Fri Oct 16 15:01:58 2020
    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.


    Following the Sun

    October 16, 2020

    Sunflower Field

    Sunflowers facing east

    Photographer: Kathy Arbuckle
    Summary Author: Kathy Arbuckle

    Late July and August is sunflower time in eastern Washington State.
    Many farm fields are filled with the cheerful faces of huge, yellow
    blooms facing east to greet the Sun each morning. Young sunflowers
    have the ability to track and follow the Sun as it passes east to
    west, displaying heliotropism, the diurnal movement of plants
    in response to the direction of the Sun.
    Researchers discovered that this is accomplished during the day by
    the plant growing slightly more stem on its east-facing side to cause
    the flower head to gradually face west, while at night it grows a
    longer stem on the west-facing side to return the bud to facing east.
    This cycle is repeated every 24 hours, according to the plant's
    internal circadian clock.
    Sunflowers stop this mechanism at maturity and from then on set the
    blooming flowers facing east permanently, benefiting the plant's
    ability to attract bees and other pollinators to their golden,
    sun-warmed flowers. Photos taken on July 20, 2020.

    Photo Details: Top - Camera NIKON COOLPIX P90; Software Nikon Transfer
    1.3 W; Exposure Time 0.0040s (1/250); Aperture ƒ/5.6; ISO equivalent
    64; Focal Length (35mm) 212. Bottom same except - Exposure Time 0.0027s
    (1/366); Aperture ƒ/6.3; Focal Length (35mm) 37
    * Spokane, Washington Coordinates: 47.6588, -117.4260

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    Plant Links

    * Discover Life
    * Tree Encyclopedia
    * What are Phytoplankton?
    * Encyclopedia of Life - What is a Plant?
    * USDA Plants Database
    * University of Texas Native Plant Database
    * Plants in Motion
    * What Tree is It?

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

    https://epod.usra.edu

    --- up 7 weeks, 3 days, 20 hours, 21 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)