George Preoteasa

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Viewing 15 posts - 61 through 75 (of 353 total)
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  • George Preoteasa avatarGeorge Preoteasa
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    Don, this is awesome!

    George Preoteasa avatarGeorge Preoteasa
    Participant

    Thank you Keelin

    in reply to: Partial solar eclipse, Beijing – APOD image #326603
    George Preoteasa avatarGeorge Preoteasa
    Participant

    A couple of things about eclipses. I got my eclipse dates  and other information from this site:

    https://www.timeanddate.com/

    Move your mouse over “Sun & Moon” and you will see all sorts of information including eclipses. There should be a place to specify your location. I got very detailed information about the eclipse specific to New York including phases of the eclipse and the azimuth and elevation of the moon at those points.

    Now, speaking of elevation, Hans, I would have loved to put the eclipsed in some context, as you suggested, but it was difficult because the moon was very high as seen here, almost 70 degrees. I wanted to use a telephoto, so the moon is a bit bigger than a dot, but then the context needs to be at some proportional distance. For example, in the shot with the skyscrapers, they were at 11 km from me, so that ratio with the moon worked well. But if the moon is high up in the sky it’s a different story, cannot find a context at that distance. So the only thing I came up with was the combinations with the Gemini stars, which were really calling for it.

    Incidentally, it was very cold, 7F/-14C, and very windy. Reminded me of Yellowknife.

    George Preoteasa avatarGeorge Preoteasa
    Participant

    Thank you Hans.

    George Preoteasa avatarGeorge Preoteasa
    Participant

    There were some clouds early on, made more visible when the picture is enhanced.

    _A000260_ce

    George Preoteasa avatarGeorge Preoteasa
    Participant

    Here are my modest shots. Blood moon just before totality, blood moon just after totality (not very different) and blood moon with Pollux and Castor, the two brightest stars of Gemini (and a few other stars).

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    in reply to: Contrail Thread Volume IV #326481
    George Preoteasa avatarGeorge Preoteasa
    Participant

    A distrail is the opposite of a contrail, still I thought this is the best thread to post this. I was taking a time lapse of clouds passing in front of the moon, when this happened. The time lapse is too fast, so I had to create a slowed down version. That slowed down version is not much faster than real time. Interesting how quickly these things happen.

     

     

    in reply to: Departing soul-clouds! #326339
    George Preoteasa avatarGeorge Preoteasa
    Participant

    The little cumulus-like clouds produce precipitation in the form of ice crystals and strong air currents below drag those precipitations away. Very ice shot!

    in reply to: Wave Clouds Volume II #325298
    George Preoteasa avatarGeorge Preoteasa
    Participant

    Rough fluctus. And a baby.

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    in reply to: Wave Clouds Volume II #325296
    George Preoteasa avatarGeorge Preoteasa
    Participant

    Only the surfer is missing.

    in reply to: Optical Phenomena Volume III #325295
    George Preoteasa avatarGeorge Preoteasa
    Participant

    Two very nice discrete dogs, Hans and Keelin.

    in reply to: Partial solar eclipse, Beijing – APOD image #325019
    George Preoteasa avatarGeorge Preoteasa
    Participant

    Hi Laurence, this is an outstanding picture helped by the combination of circumstances. The sun is low, so no filter needed, therefore you can capture the landscape. Beautiful, thanks for sharing!

    I am in a bit of a panic. We have a lunar eclipse coming in just over a week and I am still thinking what kind of shot(s) to take. The moon will be pretty high up, so if I am using a telephoto to get some moon details, it will be hard to get some landscape around it. Oh well, I still have time to think. (And it may even be snowing, who knows?)

    Will the lunar eclipse be visible by you?

    I caught on “film” a partial lunar eclipse in the early 2018. The moon set well before totality. But it looked great anyway.

     

    DSC03979_ce

    George Preoteasa avatarGeorge Preoteasa
    Participant

    Folks, thank you all for your compliments and encouragements to show more. I am glad to do that. Here is a link to the trip album I created. Not just the Aurora, but also a few “frozen” moments. And a Bullock’s Bistro interior pano, maybe Don can see his signature :-)

    https://photos.app.goo.gl/3ozHZMxuBzSSvh9E8

    George Preoteasa avatarGeorge Preoteasa
    Participant

    Fascinating, Laurence. Thanks for sharing. There are two accepted theories about how rain forms. One, applicable to CB clouds, is that it all starts as ice crystals that grow at first by direct deposit of water molecules onto them. At some point,they are heavy enough to start falling and they grow by accretion, the tiny droplets they hit freeze on them instantly. As they get lower, the temperature of the air increases above freezing and they begin to melt. If they are very big, some survive and hit the ground as hail.

    How big can the hail balls be up in the clouds? Maybe 15 cm. The updrafts can be 50 m/s and will keep these big balls up. In fact they can go up and down more than once as they get picked up by different updrafts. Mind boggling what happens up there.

    in reply to: New Years Day Clouds 2019 #324389
    George Preoteasa avatarGeorge Preoteasa
    Participant

    I think it’s a fallstreak hole. The reason is that those “cirrus” clouds are below the altocumulus, You can see that on the right end of the gap.

Viewing 15 posts - 61 through 75 (of 353 total)