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  1. #1
    Anthony Ayiomamitis's Avatar
    Anthony Ayiomamitis Guest

    Default Colourful spring sunset



    Dear group ... and oriel,

    The temperatures are rising very nicely and the skies are very slowly
    returning back to normal.

    Yesterday evening there were some low-level clouds in the immediate
    vicinity of where I plan to shoot some photos over the next couple of
    days of the sun setting behind a large home. In fact, the imaging
    train (Tak FSQ plus AP 2x APO barlow) is such so as to yield a nice
    aspect ratio between the house and setting sun as well as a nice fit
    to the field of view of my EOS 350D.

    The trees (and house) in the distant foreground (see bottom right
    corner) are approximately 1940 meters away: http://perseus.gr/Astro-Solar-Sunset-13.htm

    Clear skies!

    Anthony.

  2. #2
    anthony@perseus.gr's Avatar
    anthony@perseus.gr Guest

    Default Colourful spring sunset

    On 12 ┴­˝, 00:02, oriel36 <kelleher.ger...@gmail.com> wrote:

    Gerry,

    Thanks for the link. It is quite an impressive photo.

    Anthony.

  3. #3
    bluemoon's Avatar
    bluemoon Guest

    Default Colourful spring sunset

    oriel36 wrote:
    Is there a name for that daylight to darkness boundary?

  4. #4
    palsing's Avatar
    palsing Guest

    Default Colourful spring sunset

    On Apr 11, 6:27 pm, bluemoon <bluem...@tech.net> asked:

    ************

    The first word that comes to mind is "twilight".

    On the moon we would call the line between sunlit and shadow the
    "terminator". Maybe this also applies to the earth, however, because
    the moon has no atmosphere, the terminator is sharp, whereas on earth
    it is fuzzy, so there is a time-lag between sunlit and complete
    darkness.

    There is a lot to know about twilight, and it is all very interesting.
    For a very complete description of the three kinds of twilight, civil
    twilight, nautical twilight, and astronomical twilight, see this page;

    http://aa.usno.navy.mil/faq/docs/RST_defs.php

    \Paul A

  5. #5
    bluemoon's Avatar
    bluemoon Guest

    Default Colourful spring sunset

    palsing wrote:


    You are correct, it's the terminator, but I was hoping that he would
    attempt to answer it. I guess you saved him the embarrassment.

  6. #6
    anthony@perseus.gr's Avatar
    anthony@perseus.gr Guest

    Default Colourful spring sunset

    On 12 ┴­˝, 10:41, bluemoon <bluem...@tech.net> wrote:

    Are you referring to me? I wish I had seen your message earlier so as
    to have also suggested "terminator" but I suspect we have a large
    difference zone time difference.

    It is quite difficult to be involved with astrophotography and not to
    recognize the term "terminator". In fact, a significant portion of
    hires high-power imaging involving the moon is accomplished around the
    (lunar) terminator.

    Anthony.

  7. #7
    bluemoon's Avatar
    bluemoon Guest

    Default Colourful spring sunset

    anthony@perseus.gr wrote:


    I was referring to our resident celestial mechanics expert who posted
    the first reply to your new thread. I think you can guess who that is. ;-)

    Sorry about the confusion.

  8. #8
    anthony@perseus.gr's Avatar
    anthony@perseus.gr Guest

    Default Colourful spring sunset

    On 15 ┴­˝, 04:49, Quadibloc <jsav...@ecn.ab.ca> wrote:

    John, thanks for the correction. You are absolutely right and I have
    already modified the text.

    Anthony.

 

 

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