• ES Picture of the Day 19 2021

    From Black Panther@21:1/186 to All on Tue Jan 19 11:01:04 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.


    Bright Parhelion over Syracuse, Italy

    January 19, 2021

    Rsz_20201121_185927-01

    Photographer: Barbara Pindo
    Summary Authors: Barbara Pindo; Jim Foster
    One afternoon this past fall, I decided to photograph the sky near my
    home in Syracuse, Italy. My friends Massimo Tamajo and Salvo Basile
    pointed out a bright parhelion, shown above, near the western
    horizon. These colorful patches of light form when sunlight
    interacts with hexagonal, plate-shaped ice crystals -– sunlight
    enters one of the crystal’s side faces, exiting through an alternate
    side face. Look for them approximately 22-degrees from the Sun, at
    the same solar altitude. If you’re lucky, you may see one or either
    side of the Sun (parhelia). This one happened to be to the Sun's
    right. Note that unlike rainbows, parhelia or sundogs are
    red-colored toward the Sun, as is the case for all 22-degree
    halo-related phenomena. Photo taken on November 21, 2020.
    Photo Details: Camera: Samsung SM-G965F; Exposure Time: 0.0003s
    (1/3344); Aperture: ƒ/2.4; ISO equivalent: 50; Focal Length (35mm): 26
    * Syracuse, Italy Coordinates: 37.08957, 15.27089

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    Atmospheric Effects Links

    * Atmospheric Optics
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    * 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

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  • From Black Panther@21:1/186 to All on Fri Feb 19 11:00:42 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.


    Pantalica and Mongibello, Sicily

    February 19, 2021

    6a0105371bb32c970b026bdebb71e7200c

    Photographer: Orazio Mezzio
    Summary Author: Orazio Mezzio

    Seen above is the megalithic necropolis of Pantalica in the
    province of Syracuse, Italy. These cemeteries contain over 5,000 tombs
    and were in use between the 13th and 7th century BC in the late
    Bronze Age. In 2005, this site was awarded, together with the city
    of Syracuse, the title of World Heritage Site by UNESCO for its
    special historical, archaeological, speleological and landscape
    profiles. Mount Etna (also known as Mongibello) is steaming in the
    background.
    * Pantalica, Italy Coordinates: 37.1415, 15.0297

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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

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  • From Black Panther@21:1/186 to All on Fri Mar 19 11:00:42 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.


    Pink Virga

    March 19, 2021

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    Photographer: Juan Manuel Pérez Rayego
    Summary Authors: Juan Manuel Pérez Rayego; Jim Foster

    The gauzy, pinkish veil shown above at right center is actually rain
    falling through the atmosphere, as observed near Merida, Spain.
    The Sun had been behind these stratocumulus clouds for several
    minutes prior to the photo being snapped. At first glance, it looked
    like a pink mist was falling, and then I realized that this
    precipitation likely wasn’t reaching the ground ( virga), as the
    air near the surface was quite dry. Photo taken at sunset on
    November 9, 2020.
    * Merida, Spain Coordinates: 38.9394, -6.3652

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    Cloud Links

    * Atmospheric Optics
    * The Cloud Appreciation Society
    * 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

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  • From Black Panther@21:1/186 to All on Mon Apr 19 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.


    Ice Cover and Ice-Out on Sebago Lake During the Winter of 2021

    April 19, 2021

    Katy and George kite aerial photo ice Sebago 021721 2

    Sebago lake open water 022821

    Photographer: John Stetson
    Summary Author: John Stetson

    The photo above, at top, shows an aerial view (from a kite) of the ice
    cover on Sebago Lake, Maine, as observed on February 17, 2021. A
    ground view is shown in the bottom photo. There was just enough ice
    this past February for the local Rotary Club to safely hold an ice
    fishing derby. Nonetheless, the ice was short-lived – open water was
    reported 10-days later. Even though the entire lake didn't freeze in
    2021, the official ice-out date occurred on March 29. Click here to
    see a record of ice-out dates for the past 20-years.
    * Sebago Lake, Maine Coordinates: 43.85, -70.56666

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    Cryosphere Links

    * Guide to Frost
    * What is the Cryosphere?
    * Bentley Snow Crystals
    * Glaciers of the World
    * Ice, Snow, and Glaciers: The Water Cycle
    * The National Snow and Ice Data Center Google Earth Images
    * Snow and Ice Crystals

    -
    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 May 19 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.


    Battle of the Moons

    May 19, 2021


    PSX_20210428_122303

    Photographer: Soumyadeep Mukherjee
    Summary Author: Soumyadeep Mukherjee

    The photo above displays the angular size difference between a
    supermoon and a "micro" Moon. The smaller Moon was the Cold Moon of
    2020 (captured at apogee on the 30th of December 2020), and the
    supermoon was the Pink Moon of 2021 (captured at perigee on the
    27th of April 2021). The supermoon was almost 10% bigger in the
    night sky due to its closer approach to Earth.
    Photo details: Nikon D5600 camera; Sigma 150-600 lens; 85% of 280
    images stacked via Pipp and Autostakkert for each Moon shot and
    processed together in Adobe Camera Raw and Photoshop.

    Kolkata, India Coordinates: 22.5726, 88.3639

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    Night Sky Links

    * Space Weather Live
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    * American Meteor Society
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    * 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

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  • From Black Panther@21:1/186 to All on Mon Jul 19 11:00:42 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.


    Noctilucent Clouds Above Paris on a Summer’s Eve

    July 19, 2021

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    1 (16)

    Photographer: Bertrand Kulik

    Summary Authors: Bertrand Kulik; Jim Foster

    Featured above are views of noctilucent clouds above Paris, France,
    as observed around 11:20 p.m., local time, on June 18, 2021. These
    high-altitude icy clouds form some 55 miles (88 km) above the
    Earth’s surface. Typically only seen in polar regions and in the high
    middle latitudes in spring and early summer, they appear to glow
    because they’re high enough to still be illuminated by sunlight
    that’s no longer reaching the surface far below.

    Photo details:

    Top photo - Canon EOS 5D Mark III; EF50mm; f/1.8; STM; ƒ/5.6 50.0 mm;
    10 second exposure; 100 ISO.

    Bottom photo - Canon EOS 5D Mark III; TAMRON SP 15-30mm; F/2.8; Di VC
    USD A012; ƒ/5.6 26.0 mm; 8 second exposure 100 ISO.
    * Paris, France Coordinates: 48.8566, 2.3522

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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 10 weeks, 3 days, 12 hours, 15 minutes
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  • From Black Panther@21:1/186 to All on Thu Aug 19 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.


    Atoms and Molecules

    August 19, 2021

    QuartzCrystals2021e

    Photographer: Thomas McGuire

    Summary Author: Thomas McGuire

    The word atom originated thousands of years ago as a philosophical
    idea that there might be a smallest division to every substance. It was
    a concept with neither evidence nor application. But, in the early
    1800s John Dalton observed that elemental substances combine in
    consistent numerical ratios, which provided a scientific basis for the
    idea of atoms. Still, this was indirect, non-observable evidence of
    atoms. Regardless, Dalton’s discovery led to many useful principles in
    chemistry.

    There is, however, observational evidence of atoms in minerals.
    Each of the characteristic shapes of mineral crystals can be attributed
    to the spatial patterns of atoms and molecules. For example, quartz
    (SiO ) can form beautiful six-sided crystals because of the way
    atoms of silicon and oxygen join in hexagonal patterns, as
    shown above in the picture and illustration.

    You can also see evidence of irreducible units if you deposit a
    small drop of a light, insoluble liquid such as oleic acid (the
    principal ingredient of olive oil) on a water surface. The oil will
    only spread out to a consistent limiting thickness before it breaks
    apart. This experiment has two implications. First, it is more evidence
    that there is some kind of irreducible unit of matter.
    ( Subatomic particles are beyond the scope of these kinds of
    observations.) The second is that this is an indication of the diameter
    of one of those units even though oleic acid (C H O ) is a
    relatively large molecule. For comparison, oleic acid is 10^-9 m
    compared to a hydrogen atom which is 10^-11 m.

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    Geology Links

    * Earthquakes
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    * General Dictionary of Geology
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    -
    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 Sun Sep 19 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.


    Archive - Earth's Shadow in Red Light

    September 18, 2021

    6a0105371bb32c970b019b00f50755970b

    Every weekend we present a notable item from our archives.

    This EPOD was originally published November 30, 2013.

    Photographer: Luis Argerich
    Summary Authors: Luis Argerich; Jim Foster

    6a01116860210d970c019b00fbd174970c-320wi The photo above shows a
    view near Tornquist, Argentina, using a filter sensitive to the 720
    nm region (red light) of the electromagnetic spectrum. This is
    the far-end of the visible spectrum -- wavelengths are longer here
    than in the green or blue portions of the spectrum. The camera is
    looking toward the eastern horizon just after sunset. Note the
    blue-fringed strip of sky between the two hill slopes at center. This
    is known as the Belt of Venus. Our eyes, which utilize the entire
    visible spectrum (from about 375-750 nm), sees this band in pinkish
    hues. The dark wedge below the Belt of Venus is the edge of night --
    the rising Earth's shadow. Healthy vegetation appears white here
    since chlorophyll is reflective in red light. The photo at left
    shows that, even in winter, the Argentinian plains are always green. It
    was taken on July 5, 2013, the same day and at the same location as the
    above photo.

    Photo details - Inset: Camera Model: Canon EOS 6D; Aperture: f/0.0;
    Exposure Time: 0.017 s (1/60); ISO equiv: 1600.
    * Tornquist, Argentina Coordinates: -38.071660,-62.008162

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    Geography Links

    * Atlapedia Online
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    * Holt Rinehart Winston World Atlas
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    -
    Earth Science Picture of the Day is a service of the Universities
    Space Research Association.

    https://epod.usra.edu

    --- up 2 weeks, 2 days, 21 hours, 55 minutes
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  • From Black Panther@21:1/186 to All on Tue Oct 19 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.


    Odd-Radius Lunar Halos Encircling Jupiter and Saturn

    October 19, 2021

    PSX_20210825_195952

    Photographer: Soumyadeep Mukherjee

    Summary Author: Soumyadeep Mukherjee

    The halos around the Moon are the odd-radius halos caused
    by pyramidal shaped ice crystals, as confirmed by Les Cowley via
    EarthSky. These sorts of optical halos are considered to be rarer
    than the even radius halos caused by plate or column shaped ice
    crystals ( 22° and 46° halos). Also, there are multiple halos
    around the moon visible. As a bonus, these halos encircle Jupiter
    (on the left of the moon) and Saturn (on the right of the moon) as
    the three celestial bodies came for a near-conjunction in the night
    sky. These halos appeared for 10 minutes while I was able to capture
    them from my home in Kolkata, India. Photo taken on August 21,
    2021.

    Photo details: Gear: Nikon D5600, Tokina 11-16 atx-i lens, f/4, 8
    second exposure, ISO-320, 11mm focal length, Adobe Camera Raw,
    Photoshop
    * Kolkata, India Coordinates: 22.5726, 88.3639

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    Applied Sciences Links

    * BBC: World Water Crisis
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    -
    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 Fri Nov 19 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.


    Green Flash Observed Through Archway of Torre della Meloria

    November 19, 2021


    MELORIA-raggio-verde2-firmata-Hi

    Photographer: Marco Meniero

    Summary Author: Marco Meniero

    For several years I had hope to be able to take a photo of the
    green flash through the archway of the Meloria’s Tower (in
    front of Livorno Town Tuscany, Italy). This flash is a wink of
    emerald green light that can on occasion be observed just as the Sun
    disappears below the horizon. The primary challenge was that I had to
    exactly calculate where to stand to capture the last rays of the
    setting Sun as it passed through the Tower’s arch. I relied both on my
    experience to be able to predict the Sun’s position several tens of
    minutes in advance and also on the PhotoPills app, which worked
    with extreme precision.

    The results are shown above. This photo sequence was captured on the
    evening of July 20, 2021. If you look at the tower, at far right,
    you'll notice that even though the solar disk itself was nearly
    entirely below the horizon, two lateral points remained visible – both
    were green. The one on the right can be seen exactly through the Torre
    della Meloria.

    The tower dates back to 1709. It consists of four pillars joined by
    pointed arches on which the body of the tower itself rests on the
    surface of the sea in such a way to minimize resistance to waves. It
    was on this stretch of the Ligurian Sea in 1284 that a famous
    battle took place where the fleet of the Republic of Genoa
    overwhelmed that of the Republic of Pisa.

    Photo details: Canon Eos1DxMk2, EF 400 IS f / 2.8, closed at f / 5, 200
    Iso, solar discs shot with a time of 1/2500, Green flash with a time of
    1/1000. Date 07-20-2021
    * Livorno Town Tuscany, Italy Coordinates: 43.5485, 10.3106

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    Atmospheric Effects Links

    * Atmospheric Optics
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    * 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

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