APOD: Moon Setting Behind Teide Volcano (2018 Jun 04)

Comments and questions about the APOD on the main view screen.
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APOD: Moon Setting Behind Teide Volcano (2018 Jun 04)

Post by APOD Robot » Mon Jun 04, 2018 4:09 am

Image Moon Setting Behind Teide Volcano

Explanation: These people are not in danger. What is coming down from the left is just the Moon, far in the distance. Luna appears so large here because she is being photographed through a telescopic lens. What is moving is mostly the Earth, whose spin causes the Moon to slowly disappear behind Mount Teide, a volcano in the Canary Islands off the northwest coast of Africa. The people pictured are 16 kilometers away and many are facing the camera because they are watching the Sun rise behind the photographer. It is not a coincidence that a full moon rises just when the Sun sets because the Sun is always on the opposite side of the sky from a full moon. The featured video was made last week during the full Milk Moon. The video is not time-lapse -- this was really how fast the Moon was setting.

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Re: APOD: Moon Setting Behind Teide Volcano (2018 Jun 04)

Post by Boomer12k » Mon Jun 04, 2018 4:24 am

Great Video... if I had been there I would be "marching" up and down...like I was walking on the Moon...

My Mare Crisium...Moon's Crisium basin... from several nights ago.

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Re: APOD: Moon Setting Behind Teide Volcano (2018 Jun 04)

Post by JohnD » Mon Jun 04, 2018 8:36 am

Extraordinary! Of course I know that the Moon (and Sun) move across our sky, but even watching them (Sun-carefully) against a skyline object their speed isn't obvious.

Side issue. When I see a full Moon, I see the Man in the Moon - other cultures see Hares etc. But in telescopic views the paradoeilic image vanishes. Is this cultural, or what?

John

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Re: APOD: Moon Setting Behind Teide Volcano (2018 Jun 04)

Post by ygmarchi » Mon Jun 04, 2018 9:36 am

There are 1440 minutes in a day. And 720 moon disks or sun disks in a full circle. So on average in takes about 2 minutes for the moon or the sun to set or to rise. Which is more or less how long the movie is.

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Re: APOD: Moon Setting Behind Teide Volcano (2018 Jun 04)

Post by Indigo_Sunrise » Mon Jun 04, 2018 10:51 am

This is a really great video!
I have a question: in several places, it looks as though there is smoke coming from the top of the mountain. Are the people up there burning bonfire(-type) things? Or is the smoke coming from the volcano itself?
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Re: APOD: Moon Setting Behind Teide Volcano (2018 Jun 04)

Post by orin stepanek » Mon Jun 04, 2018 11:44 am

Moon went down; All gone! :lol2: That is; until tomorrow! :wink:
Orin

Smile today; tomorrow's another day!

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Re: APOD: Moon Setting Behind Teide Volcano (2018 Jun 04)

Post by bls0326 » Mon Jun 04, 2018 12:58 pm

A really eye-catching video. Good work!

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Re: APOD: Moon Setting Behind Teide Volcano (2018 Jun 04)

Post by neufer » Mon Jun 04, 2018 1:24 pm

ygmarchi wrote:
Mon Jun 04, 2018 9:36 am

There are 1440 minutes in a day. And 720 moon disks or sun disks in a full circle. So on average in takes about 2 minutes for the moon or the sun to set or to rise. Which is more or less how long the movie is.
A Supermoon can take over two and a half minutes to "move" its full width (and longer to set).
Art Neuendorffer

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Re: APOD: Moon Setting Behind Teide Volcano (2018 Jun 04)

Post by Chris Peterson » Mon Jun 04, 2018 1:51 pm

JohnD wrote:
Mon Jun 04, 2018 8:36 am
Extraordinary! Of course I know that the Moon (and Sun) move across our sky, but even watching them (Sun-carefully) against a skyline object their speed isn't obvious.
If you've ever tried to set up a non-tracking telescope for other people to view through, you'll know just what a short time you have before having to take it back and reposition it. At very low magnification, as when looking at the entire Moon, you have a minute or two. At higher magnification an object may pass across the entire field in just a few seconds.
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Re: APOD: Moon Setting Behind Teide Volcano (2018 Jun 04)

Post by Rusty Brown in Cda » Mon Jun 04, 2018 3:07 pm

"...a full moon rises just when the Sun sets because the Sun is always on the opposite side of the sky from a full moon."
I am reminded of Neil Young's lyric from "After the Gold Rush"
I was lying in a burned out basement
With the full moon in my eyes.
I was hoping for replacement
When the sun burst thru the sky.

Great song, but unlikely premise.

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Re: APOD: Moon Setting Behind Teide Volcano (2018 Jun 04)

Post by efahl » Mon Jun 04, 2018 3:28 pm

Awsome video, can anyone tell me how long that lens is? I see 1.4 + 2.0 extenders, probably on a 1000 mm, so effectively 2800 mm???

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Re: APOD: Moon Setting Behind Teide Volcano (2018 Jun 04)

Post by neufer » Mon Jun 04, 2018 6:54 pm

Indigo_Sunrise wrote:
Mon Jun 04, 2018 10:51 am

I have a question: in several places, it looks as though there is smoke coming from the top of the mountain. Are the people up there burning bonfire(-type) things? Or is the smoke coming from the volcano itself?
https://en.wikipedia.org/wiki/Teide wrote:

.
<<Mount Teide (Spanish: Pico del Teide) is a volcano on Tenerife in the Canary Islands, Spain. Its 3,718-metre summit is the highest point in Spain and the highest point above sea level in the islands of the Atlantic. If measured from the ocean floor, it is at 7,500 m the highest volcano in the world base-to-peak outside of the Hawaiian Islands, and is described by UNESCO and NASA as Earth's third-tallest volcanic structure. The summit of the volcano has a number of small active fumaroles emitting sulfur dioxide and other gases, including low levels of hydrogen sulfide.>>
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Re: APOD: Moon Setting Behind Teide Volcano (2018 Jun 04)

Post by Biochemiker » Mon Jun 04, 2018 7:30 pm

efahl wrote:
Mon Jun 04, 2018 3:28 pm
Awsome video, can anyone tell me how long that lens is? I see 1.4 + 2.0 extenders, probably on a 1000 mm, so effectively 2800 mm???
Making a lot of assumptions here, but I think twice that? 5600mm focal length? This is a very rough calculation made by measuring the height of a person on the mountain and assuming that he/she is 1.82 meters tall and the distance is 16 km. Then, I assumed that the movie is in the 16x9 format on the Sony APS-C sensor (which would be 6000x4000 on the alpha6300 but cropped to 6000x3375).

Happy to be corrected when someone figures out the actual focal length!

Biochemiker

Focal length question

Post by Biochemiker » Mon Jun 04, 2018 7:47 pm

The reason that I don't think that my answer is plausible is that the focal length of the telescope necessary for that would be 2000mm (at f/8 it'd have a diameter of 250 mm or 9.8 inches which doesn't look right from the photo). Or, one of the other elements in the path could be an additional 2x teleconverter on a 1000mm focal length telescope. Or, this could be a heavy crop from the full image although this seems unlikely given the image on the tilt-screen.

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Re: APOD: Moon Setting Behind Teide Volcano (2018 Jun 04)

Post by Boomer12k » Tue Jun 05, 2018 1:24 am

JohnD wrote:
Mon Jun 04, 2018 8:36 am
Extraordinary! Of course I know that the Moon (and Sun) move across our sky, but even watching them (Sun-carefully) against a skyline object their speed isn't obvious.

Side issue. When I see a full Moon, I see the Man in the Moon - other cultures see Hares etc. But in telescopic views the paradoeilic image vanishes. Is this cultural, or what?

John
I think that is cultural...now I see....the Energizer Rabbit in The Moon...no really... down near the bottom of the page...see pic...

http://asterisk.apod.com/viewtopic.php? ... it#p253847

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Re: Focal length question

Post by efahl » Mon Jun 11, 2018 2:18 pm

Biochemiker wrote:
Mon Jun 04, 2018 7:47 pm
Or, this could be a heavy crop from the full image although this seems unlikely given the image on the tilt-screen.
Looking at the framing of the video and the view finder on the camera, I think that the video is indeed is cropped down considerably. The view finder is showing about a 5x-wider chunk of the peak...

Biochemiker

Re: Focal length question

Post by Biochemiker » Thu Jun 14, 2018 3:07 pm

Ah, yes. You are correct. Maybe not 5x but still a heavy crop.
efahl wrote:
Mon Jun 11, 2018 2:18 pm
Biochemiker wrote:
Mon Jun 04, 2018 7:47 pm
Or, this could be a heavy crop from the full image although this seems unlikely given the image on the tilt-screen.
Looking at the framing of the video and the view finder on the camera, I think that the video is indeed is cropped down considerably. The view finder is showing about a 5x-wider chunk of the peak...