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Featured Stargazing U.S. Solar Eclipse of Aug. 21, 2017

  1. Jul 25, 2017 #181


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    Watch the video and try to visualize that it is the Earth that rotates, while the Sun stays in the same direction.
  2. Jul 26, 2017 #182
    Some folks just have no appreciation for celestial mechanics.:sorry:
    Here is one that will be more "in tune"

    It will also likely lead to...

    Also "That 70's show" isn't a reliable source of information.
    Good call, John Day seems like a better bet. Just "Head East" until you don't see anymore Banana Slugs, they are a reliable climate indicator.:wink:
  3. Jul 26, 2017 #183
  4. Jul 28, 2017 #184
    This http://eclipse.montana.edu/ is a pretty cool take on a project done in Oz during the 2012 Eclipse.
    "Taken from a high-altitude balloon, it shows Australia’s Nov. 14, 2012 total solar eclipse as seen from 37,000 meters (120,000+ feet, nearly 23 miles) above the Earth"
  5. Jul 31, 2017 #185


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    It took me awhile, but it appears that she was fogged in.

    We could see across the way to Goldendale Washington where the observatory was broadcasting on NBC news and where a huge crowd had gathered as a huge cloud condensed out of the cooling air and settled in right over the observatory. We could see I-84 along the Columbia River fill up with cars stopped bumper to bumper, fog forming over them. [ref]​

    Those two songs, along with my signature song, seem to have been inspired by eclipses.

    "The Word"

    This garden universe vibrates complete.
    Some we get a sound so sweet.
    Vibrations reach on up to become light,
    And then thru gamma, out of sight.
    Between the eyes and ears there lay,
    The sounds of colour and the light of a sigh.
    And to hear the sun, what a thing to believe.
    But it's all around if we could but perceive.
    To know ultra-violet, infra-red and X-rays,
    Beauty to find in so many ways.
    Two notes of the chord, that's our fluoroscope.
    But to reach the chord is our lifes hope.
    And to name the chord is important to some.
    So they give a word, and the word is OM.


    The rain is on the roof
    Hurry high butterfly
    As clouds roll past my head
    I know why the skys all cry
    OM, OM, Heaven, OM

    The Earth turns slowly round
    Far away the distant sound
    Is with us everyday
    Can you hear what it say
    OM, OM, Heaven, OM

    [watch the eclipse musical interlude]

    The rain is on the roof
    Hurry high butterfly
    As clouds roll past my head
    I know why the skys all cry
    OM, OM, Heaven, OM

    [insert Archimedean Spiral images from the end of the video, my driveway, and FB post]​

    I'm guessing that "I know why the skys all cry" is euphemism for; "I know why these guys all cry", as they were not in right place, at the right time.
    And "Hurry high butterfly", is an image of the corona.

    A hmmm...... This is the way my brain works.

    Never watched it. (Ok. Maybe once, but just to confirm that people who lived through it, didn't really remember it.)

    ps. Have done tons of preliminary experimenting over the last two weeks.

    I've decided against the 500 & 1000 lines per millimeter diffraction grating, and opted for a 200 lines/mm glass "Woo woo. Rainbows!" lens I found in an old box.
  6. Jul 31, 2017 #186
    Ahh, the coastal curse.:sorry:
    Interesting, I never would have made the Moody Blues connection.
    Same here, I don't have patience enough to relive that one.
  7. Aug 2, 2017 #187


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    This is a nice link that I found yesterday. It shows the path of totality on the map. By clicking on the map, it pops up a table showing the times when the eclipse and its totality begin and end.

    CAUTION for reading times in the table: The times are given in UTC which is centered in England. There is a timezone display option on the left of the screen that shows the UTC correction for the point that you selected. However, it doesn't change the displayed times in the table. For those who don't know UTC, the tables in Oregon will show max eclipse times from 17:16 to 17:26. This is 12:16 to 12:26 LOCAL time.
    Last edited: Aug 2, 2017
  8. Aug 4, 2017 #188


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    Here's a question that may be difficult to answer. I've been desparately trying to find a place to watch the eclipse, that is not overrun by crowds. A friend invited me to watch at his house near Bend, OR. But he warned me that the country road near his house is expected to be overwhelmed by 500,000 people in the 20 miles between his house and the eclipse centerline. Therefore, he is unwilling to go even one mile closer because of the horror scene.

    The NASA site says that his house will experience 99.97% occlusion. My question: will I be able to see the sun's corona with that 99.97%?
  9. Aug 4, 2017 #189


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    0.03% of the sunlight corresponds to mag -18, while the corona seems to have a similar brightness as the full moon, about mag -8. The brightness contrast would be similar to a star directly next to the full moon, and worse than Jupiter's moons compared to Jupiter (two of them are easily bright enough for the human eye - but you don't see them because Jupiter is too bright and too close).

    To make it worse, the brightness of the sky will still be significant. It might outshine the corona, even if you can block the spot of direct sunlight.

    Doesn't sound promising.
  10. Aug 4, 2017 #190


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    My guess is yes based on watching some Youtubes where people are shouting "Corona!" during the Diamond Ring. But that 0.03% giving you the Diamond Ring is still bright photosphere, and you are heavily discouraged from viewing it without a filter. And with a filter, you won't see the corona. So you'll be breaking everyone's safety advice by trying. Besides, the view of the corona will be much better with the photosphere completely blocked out. The amount of time you can see the corona will be greatly extended if you can complete the final 20 miles.

    With 20 miles to the centerline, your friend must be closer to Redmond than Bend. 20 miles from centerline is in the path of totality.

    Here's a simulation I made of the view from Bend. Find your friend's Latitude and Longitude and change it. Every 0.1 degrees more in latitude is about 7 miles. Notice how vastly the sky is improved by juat adding 0.1 degrees to latitude. Keep in mind this simulation is simply my guess as to what it will look like based on 2 total eclipses I have seen (but rained out) and 3 annular eclipses.

  11. Aug 4, 2017 #191


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    That's awesome. Thank you. I'll let you know how it turns out.
  12. Aug 4, 2017 #192


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    I have a feeling that someone didn't like my "info-graphic" that I posted on FB last week.


    Which is probably a good thing, as now that I think about it, it is still a crumby explanation.
  13. Aug 6, 2017 #193


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    Eclipse test shot, taken with a Canon EOS T3i on a focal reduced Explore Scientific 127CF, at about 710mm focal length.

    Eclipse Test.jpg

    Full resolution, but cropped image available here:

    How far out from the sun does the corona typically get? I'm thinking I might need a little less focal length...
  14. Aug 6, 2017 #194


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    From May:
    From the second corona image, it appears to extend beyond 3 moon diameters.


    Though, if you read closely, this requires "bracketing", and special software.
    The above image is a composite of 34 images, with exposure lengths from 1/1000 to 8 seconds.

    This Druckmüller fellow is a pretty good source. From his home page;

    Solar eclipse photography if one of the most difficult tasks of astronomical photography. There are at least three reasons for that. The first and main one is the extreme contrast which makes impossible to record the phenomenon on a single image. Neither classical nor digital photography have the ability to master the brightness ratio which is necessary for successful eclipse photography. The second reason is little chance for making experiments. If anything gets wrong it may take years to get an opportunity for a new experiment. The last but not the least reason is the fact that processing of images taken during total eclipse is very complicated and time consuming work with needs of one purpose software being developed specially for this aim.
  15. Aug 7, 2017 #195


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    Was just snooping around on the website of the town I plan on staying at for the eclipse, and saw the following URL snippet:

    I thought; "What a strange coincidence, that's where that fellow I just mentioned on PF is from. I wonder......."

    The team is headed by Miloslav Druckmϋller and Jana Hoderová.

    The expedition team of around 30, composed both of members from Brno university and Institute of Astronomy of the University of Hawaii, will take up positions at a series of locations across the west of the United States. In fact, positions will be taken at five points in four states.

    The crucial one will be at Mitchell, Oregon, where the conditions are expected to be at their best. And one of the sites there will be Whiskey Mountain...

    I plan on camping just 5 minutes from Mitchell. Odd to think I might actually meet him. Though, Whiskey Mountain is a 150 mile drive from Mitchell, so maybe not.
  16. Aug 8, 2017 #196
    A) With eclipse only a few days away (~2wks), it might be a good idea, especially for those studying eclipse related and/or other phenomena or issues during the eclipse etc., to have an idea about current solar events etc.

    For updates and point of reference e.g. see:



    + http://www.swpc.noaa.gov/

    For example, there is [still] currently a sunspot group (2670), that came from group AR2665 (renamed). There was a thread recently by @davenn:

    For a brief summary of the history of that latest (still active) sunspot region see also e.g. :

    B) Also, isn't it time to start looking at regional weather reports?
  17. Aug 8, 2017 #197
    At this point it's probably just space filler but you have to admit this is a pretty cool Eclipse shot.:cool:
  18. Aug 8, 2017 #198


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    This is an interesting interview of the two people who run the GreatAmericanEclipse.com website.

    We Asked Two Eclipse Chasers What Keeps Them Hooked
    AUG. 8, 2017 AT 12:51 PM

    My favorite comment:

    Zeiler: "On a scale of 1 to 10, a partial solar eclipse is probably a 3.
    ... A total solar eclipse has got to be a least a 1,000 [on a scale of 1 to 10]"

    So many of my friends seem to be fine with 99%, and no amount of picto-graphics that I generate, has changed anyones mind.
    Oh well. Less traffic for me.
  19. Aug 10, 2017 #199


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  20. Aug 11, 2017 #200
    This is where I'll be catching the show, looks real good as long as the showers on the 22nd don't show up early. (10 day forecasts :wink:)
    eclipse weather.PNG
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