APOD: Celestial Trails over Greece (2011 May 04)

Comments and questions about the APOD on the main view screen.

APOD: Celestial Trails over Greece (2011 May 04)

Postby APOD Robot » Wed May 04, 2011 4:09 am

Image Celestial Trails over Greece

Explanation: If you watch the horizon at just the right place and at just the right time, you can witness some spectacular juxtapositions between Earth and sky. In the above video, stars, the Moon, and even a partially eclipsed Sun were recorded rising and setting over photogenic landmarks in Greece. The inspiring video features effects on star trails that are pretty but somewhat deceiving, as stars will typically remain at nearly the same brightness as the Earth turns beneath them. Also, the time lapse nature of part of the video causes clouds to appear to jump about and fade in an unfamiliar fashion. Several stills of these scenes have appeared on APOD previously, including the partial solar eclipse over the Temple of Poseidon, cloud and star trails over a deserted church, and star trails over an old ship. Other foreground venues include an old church in Peloponnese, a stone bridge in Ioannina, a Frankish Castle in Euboea, and a picturesque sunset above Lycabettus Hill, Athens.

<< Previous APODDiscuss Any APOD Next APOD >>
User avatar
APOD Robot
Otto Posterman
 
Posts: 1864
Joined: Fri Dec 04, 2009 3:27 am

Re: APOD: Celestial Trails over Greece (2011 May 04)

Postby mexhunter » Wed May 04, 2011 4:30 am

Very well done timelapse. Excelent!!!
Greetings
César
I come to learn and to have fun.
User avatar
mexhunter
Science Officer
 
Posts: 434
Joined: Tue Apr 27, 2010 1:41 pm
Location: Monterrey, Mexico.
AKA: César Cantú

Re: APOD: Celestial Trails over Greece (2011 May 04)

Postby owlice » Wed May 04, 2011 4:46 am

Very nice, and I loved loved loved the stars raining down!
A closed mouth gathers no foot.
User avatar
owlice
Guardian of the Codes
 
Posts: 8085
Joined: Wed Aug 04, 2004 4:18 pm
Location: Washington, DC

Re: APOD: Celestial Trails over Greece (2011 May 04)

Postby Beyond » Wed May 04, 2011 5:19 am

Ahhhh, tis nice to see a movie without a lot of overpaid Stars in it. And the special effects were great also!! I rate it as 4-YEE-HA's :cowboy:
To find the Truth, you must go Beyond.
User avatar
Beyond
500 Gigaderps
 
Posts: 6517
Joined: Tue Aug 04, 2009 11:09 am
Location: BEYONDER LAND

Re: APOD: Celestial Trails over Greece (2011 May 04)

Postby Alnilam » Wed May 04, 2011 7:46 am

More of "time-lapses" in this video are not very natural : it is obvious that the changing sky is added on a still image of landscape, otherwise trees or flowers must be shaked by the wind. It is very different in the last sequence with the flag. I suppose that this choice was made to avoid the blinking of landscape, very frequent in "time-lapse" because of changes in light (clouds). Another reason to do so : star trails are made with a dark sky and the landscape is generally almost black and appears in a "shadow" mode. Without any artificial light, landscape is lightened by the moon sooner or later in the night...

In any case, the result is very artificial.
Alnilam
Ensign
 
Posts: 16
Joined: Tue Aug 04, 2009 7:47 am

Re: APOD: Celestial Trails over Greece (2011 May 04)

Postby mitsy » Wed May 04, 2011 8:05 am

Enjoyed that. Thanks.
mitsy
 

Re: APOD: Celestial Trails over Greece (2011 May 04)

Postby pistre » Wed May 04, 2011 9:13 am

What a horrible noise !
pistre
 

Re: APOD: Celestial Trails over Greece (2011 May 04)

Postby Ayiomamitis » Wed May 04, 2011 9:43 am

Alnilam wrote:More of "time-lapses" in this video are not very natural : it is obvious that the changing sky is added on a still image of landscape,

For anyone who has physically done this kind of work, the "obvious" is NOT so obvious. If we keep the camera fixed, thus having a constant field of view during the sequence, you will get what Chris has produced. The animation is created by layering sequential still images and where the brightest pixel is now added, thus incorporating the latest still and which yields motion.

otherwise trees or flowers must be shaked by the wind.

Your underlying premise is flawed. If there is NO wind, there would be no shaking of trees or flowers.

It is very different in the last sequence with the flag.

The only thing different involving Lycabettus Hill and the waving flag is the presence of winds themselves on that particular afternoon.

I suppose that this choice was made to avoid the blinking of landscape, very frequent in "time-lapse" because of changes in light (clouds).

This is software-dependent and how we handle the transition from frame to frame in the animation.

Another reason to do so : star trails are made with a dark sky and the landscape is generally almost black and appears in a "shadow" mode. Without any artificial light, landscape is lightened by the moon sooner or later in the night...

I think you missed the point here. One needs lighting (ex. the young moon) so as to illuminate the foreground. Otherwise, under a dark sky, the foreground will be grossly underexposed (if at all visible). One can result to artificial means to lighting the foreground (such as a powerful flash) but the natural lighting provided by the moon is, in my opinion, the best means.

In any case, the result is very artificial.

This is unfortunate since such a result involves a serious amount of work!

Great job, Chris.

Anthony.
Anthony Ayiomamitis
http://www.perseus.gr
Ayiomamitis
Ensign
 
Posts: 93
Joined: Wed Aug 18, 2004 3:32 pm
Location: Athens, Greece

Re: APOD: Celestial Trails over Greece (2011 May 04)

Postby Indigo_Sunrise » Wed May 04, 2011 10:52 am

I thought this video was very well done! And owlice, I agree: the 'raining stars' were pretty awesome!

And thank you, Ayiomamitis, for explaining some of the process on how this was done. (I was getting ready to repost what is fast becoming (in my mind) the APOD mantra: "If you don't like it, come back tomorrow." Or don't; we surely won't miss you!)

I especially liked the series where the stars appear to be rotating backwards - I'm assuming this is because the camera is pointing at the south celestial pole....?

Oh, and does anyone have a 'roundabout' way to view the images that are at the 'greeksky.gr' site? My work is denying access...... :cry:

A very beautiful video!

8-)
Forget the box, just get outside.
User avatar
Indigo_Sunrise
Science Officer
 
Posts: 378
Joined: Fri Jul 15, 2005 1:40 pm

Re: APOD: Celestial Trails over Greece (2011 May 04)

Postby Ayiomamitis » Wed May 04, 2011 11:33 am

Indigo_Sunrise wrote:I especially liked the series where the stars appear to be rotating backwards - I'm assuming this is because the camera is pointing at the south celestial pole....?

When the camera is pointing west, thus catching the stars setting, we have a view similar to that involving the Temple of Poseidon at Sounion (in Chris' video) which does indeed seem like the stars are rotating backwards. We are so used to watching stars rise that anything else if almost abnormal. :-)

Anthony.
Anthony Ayiomamitis
http://www.perseus.gr
Ayiomamitis
Ensign
 
Posts: 93
Joined: Wed Aug 18, 2004 3:32 pm
Location: Athens, Greece

Re: APOD: Celestial Trails over Greece (2011 May 04)

Postby orin stepanek » Wed May 04, 2011 11:54 am

Well done; and very nice! 8-)
Orin

Smile today; tomorrow's another day!
User avatar
orin stepanek
Plutopian
 
Posts: 4267
Joined: Wed Jul 27, 2005 3:41 pm
Location: Nebraska

Re: APOD: Celestial Trails over Greece (2011 May 04)

Postby snowwolf » Wed May 04, 2011 12:25 pm

Almost perfect ... but the second sentence of the description says "star trials" instead of "star trails" ... ahh those typos!
snowwolf
 

Re: APOD: Celestial Trails over Greece (2011 May 04)

Postby Lang » Wed May 04, 2011 12:53 pm

Why was it necessary to underpin those pictures with blaring, banal pop music? I can't think of anything more at odds with the pictures than that.
Lang
 

Re: APOD: Celestial Trails over Greece (2011 May 04)

Postby moonstruck » Wed May 04, 2011 12:54 pm

Fantastic very well done Chris.
moonstruck
Science Officer
 
Posts: 164
Joined: Fri Jun 18, 2010 2:27 pm

Re: APOD: Celestial Trails over Greece (2011 May 04)

Postby Ailean4321 » Wed May 04, 2011 1:27 pm

Absolutely loved this!!
I really enjoy when the APODs are videos. Its a nice change, although I love the photos as well.
Does anyone know the date of the video that expands through the universe and then zooms back in to quantum level? I remember seeing it a while back and would like to watch it again.
Thanks!
I hope everyone has a wonderful day! :)
"Oh how I wish I could shut up like a telescope! I think I could, if I only knew how to begin." -Alice
User avatar
Ailean4321
Ensign
 
Posts: 29
Joined: Fri Apr 29, 2011 2:36 pm
AKA: Jessica

Re: APOD: Celestial Trails over Greece (2011 May 04)

Postby Dustin » Wed May 04, 2011 1:52 pm

Nice. Very soothing start to my morning Thanks.
I like the way the star trails look like a slow motion meteor storm.
Dustin
Asternaut
 
Posts: 8
Joined: Sat Apr 30, 2011 4:59 pm

Re: APOD: Celestial Trails over Greece (2011 May 04)

Postby goodtime » Wed May 04, 2011 1:54 pm

Would have loved to watch the whole thing but the background music was so bad I had to turn it off.
goodtime
 

Re: APOD: Celestial Trails over Greece (2011 May 04)

Postby geckzilla » Wed May 04, 2011 2:18 pm

I guess vimeo's mute button isn't so obvious to everyone. It's the little blue vertical bars directly to the right of the play header bar. If you click to the left of those bars, it mutes the music. Anyway...

Close up of The Tree! :tree: Most APODded tree ever. :)
Just call me "geck" because "zilla" is like a last name.
User avatar
geckzilla
Ocular Digitator
 
Posts: 5876
Joined: Wed Sep 12, 2007 12:42 pm
Location: Fresh Meadows, NY

Re: APOD: Celestial Trails over Greece (2011 May 04)

Postby geckzilla » Wed May 04, 2011 2:20 pm

Ailean4321 wrote:Does anyone know the date of the video that expands through the universe and then zooms back in to quantum level? I remember seeing it a while back and would like to watch it again.


Powers of Ten
Just call me "geck" because "zilla" is like a last name.
User avatar
geckzilla
Ocular Digitator
 
Posts: 5876
Joined: Wed Sep 12, 2007 12:42 pm
Location: Fresh Meadows, NY

Re: APOD: Celestial Trails over Greece (2011 May 04)

Postby agulesin » Wed May 04, 2011 2:23 pm

snowwolf wrote:Almost perfect ... but the second sentence of the description says "star trials" instead of "star trails" ... ahh those typos!


They were testing the stars, auditioning them before they take part in another blockbuster to be released soon!

I couldn't watch it to the end, I think a little on the long side. and the music? well, that goes without saying... :roll:

PS Can anyone tell me what the link to "unfamiliar fashion http://www.baraskit.se/random/img/89/strange_fashion/1.jpg" reveals? for some reason I couldn't get into it...
agulesin
Ensign
 
Posts: 45
Joined: Mon Mar 15, 2010 12:38 pm

Re: APOD: Celestial Trails over Greece (2011 May 04)

Postby terryantrim » Wed May 04, 2011 2:56 pm

the best ever-4= yrs of viewing
terryantrim
 

Re: APOD: Celestial Trails over Greece (2011 May 04)

Postby ChrisKotsiopoulos » Wed May 04, 2011 3:36 pm

Thank you all for your kind words! This is the best possible result of more than two years of effort.
:mrgreen:

Alnilam I'm sorry you didn't like it. As my friend Anthony said it is a matter of process.
Have a look at the ship wreck startrails. You can actually see the tide at the little pool in front of the ship and the progressing startrail reflections.
See also this video and observe the Moon's shadow and the flowers move. Same video, different process:
http://vimeo.com/10158550
ChrisKotsiopoulos
Ensign
 
Posts: 30
Joined: Mon Mar 15, 2010 2:23 pm

Re: APOD: Celestial Trails over Greece (2011 May 04)

Postby Ailean4321 » Wed May 04, 2011 4:03 pm

geckzilla wrote:Powers of Ten


much thanks!! :D
"Oh how I wish I could shut up like a telescope! I think I could, if I only knew how to begin." -Alice
User avatar
Ailean4321
Ensign
 
Posts: 29
Joined: Fri Apr 29, 2011 2:36 pm
AKA: Jessica

Re: APOD: Celestial Trails over Greece (2011 May 04)

Postby Ailean4321 » Wed May 04, 2011 4:05 pm

ChrisKotsiopoulos wrote:Have a look at the ship wreck startrails. You can actually see the tide at the little pool in front of the ship and the progressing startrail reflections.


I noticed that. There is something about an old ship that captures my soul for some reason. Add that to stars and I'm completely enthralled. I think you did an awesome job! Thank you for your time and effort. :mrgreen:
"Oh how I wish I could shut up like a telescope! I think I could, if I only knew how to begin." -Alice
User avatar
Ailean4321
Ensign
 
Posts: 29
Joined: Fri Apr 29, 2011 2:36 pm
AKA: Jessica

Re: APOD: Celestial Trails over Greece (2011 May 04)

Postby geckzilla » Wed May 04, 2011 5:22 pm

agulesin wrote:PS Can anyone tell me what the link to "unfamiliar fashion http://www.baraskit.se/random/img/89/strange_fashion/1.jpg" reveals? for some reason I couldn't get into it...


It's this weird picture:
Image
Just call me "geck" because "zilla" is like a last name.
User avatar
geckzilla
Ocular Digitator
 
Posts: 5876
Joined: Wed Sep 12, 2007 12:42 pm
Location: Fresh Meadows, NY

Next

Return to The Bridge: Discuss an Astronomy Picture of the Day

Who is online

Users browsing this forum: Bing [Bot], DotNetDotCom.org [Bot], Exalead [Bot], LinkDex, Yandex Browser and 5 guests