APOD: Brisbane Sunset Moonset (2014 May 01)

Comments and questions about the APOD on the main view screen.
User avatar
APOD Robot
Otto Posterman
Posts: 3581
Joined: Fri Dec 04, 2009 3:27 am

APOD: Brisbane Sunset Moonset (2014 May 01)

Post by APOD Robot » Thu May 01, 2014 4:10 am

Image Brisbane Sunset Moonset

Explanation: In skies over Brisbane at the southeastern corner of Queensland, Australia, Planet Earth, the Sun and New Moon set together on April 29. There the celestial line-up, the first solar eclipse of 2014, was seen as a partial solar eclipse. This dramatic composite is a digital stack of images taken about 5 minutes apart with telephoto lens and solar filter. It follows the eclipse in progress, approaching a western horizon where crepuscular rays from cloud banks in silhouette joined the silhouetted Moon. From Brisbane, the maximum eclipse phase with the Moon covering about 25% of the Sun occurred just after sunset. Only from a remote spot on the continent of Antarctica was it even possible to see the eclipse in its brief annular phase, the entire dark lunar disk surrounded by a thin, bright ring of fire.

<< Previous APOD This Day in APOD Next APOD >>
[/b]

User avatar
Beyond
500 Gigaderps
Posts: 6889
Joined: Tue Aug 04, 2009 11:09 am
Location: BEYONDER LAND

Re: APOD: Brisbane Sunset Moonset (2014 May 01)

Post by Beyond » Thu May 01, 2014 4:20 am

Well that's neat! There's one more copy of today's APOD, than the number of times one see's the eclipsed moon in the APOD. I'm thinking a 6 APOD day is a record???
It would seem that Otto needs a couple of drops of oil.
To find the Truth, you must go Beyond.

User avatar
geckzilla
Ocular Digitator
Posts: 8967
Joined: Wed Sep 12, 2007 12:42 pm
Location: Modesto, CA

Re: APOD: Brisbane Sunset Moonset (2014 May 01)

Post by geckzilla » Thu May 01, 2014 4:30 am

I haven't been able to squash that bug because I can't figure out why it does that. I have tried. Oh, how I've tried.
Just call me "geck" because "zilla" is like a last name.

User avatar
Beyond
500 Gigaderps
Posts: 6889
Joined: Tue Aug 04, 2009 11:09 am
Location: BEYONDER LAND

Re: APOD: Brisbane Sunset Moonset (2014 May 01)

Post by Beyond » Thu May 01, 2014 11:06 am

Bug?? The answer is... RAID. But I don't know what the four letters stand for, so that's as far as I can help.
To find the Truth, you must go Beyond.

Oblivious

Re: APOD: Brisbane Sunset Moonset (2014 May 01)

Post by Oblivious » Thu May 01, 2014 11:43 am

Umm... isn't the moon suppose to be in opposition for the sun to cast a shadow? Just saying.

Boomer12k
:---[===] *
Posts: 2514
Joined: Sun Apr 22, 2007 12:07 am

Re: APOD: Brisbane Sunset Moonset (2014 May 01)

Post by Boomer12k » Thu May 01, 2014 12:08 pm

Interesting.


:---[===] *

MadMan

Re: APOD: Brisbane Sunset Moonset (2014 May 01)

Post by MadMan » Thu May 01, 2014 12:26 pm

Oblivious wrote:Umm... isn't the moon suppose to be in opposition for the sun to cast a shadow? Just saying.
That was only true when Pluto was a planet :lol2:

User avatar
bystander
Apathetic Retiree
Posts: 18468
Joined: Mon Aug 28, 2006 2:06 pm
Location: Oklahoma

Re: APOD: Brisbane Sunset Moonset (2014 May 01)

Post by bystander » Thu May 01, 2014 1:46 pm

Beyond wrote:Bug?? The answer is... RAID. But I don't know what the four letters stand for, so that's as far as I can help.
In IT RAID means redundant array of independent disks. It is a method of reducing data loss due to disk failure. I don't think it will help in getting rid of Otto's recurring bug.
Know the quiet place within your heart and touch the rainbow of possibility; be
alive to the gentle breeze of communication, and please stop being such a jerk.
— Garrison Keillor

eladnitram
Asternaut
Posts: 2
Joined: Thu May 01, 2014 1:56 pm

Re: APOD: Brisbane Sunset Moonset (2014 May 01)

Post by eladnitram » Thu May 01, 2014 2:41 pm

In comparing this image to yesterday's APOD, it occurs to me that one of the images is "flipped." Since totality didn't occur until after sunset in Australia, it doesn't seem possible that the moon would have eclipsed the left/upper left of the sun in Brisbane and then the upper right of the sun by the time it set in Adelaide, 1300 miles to the west. Am I missing something?

User avatar
geckzilla
Ocular Digitator
Posts: 8967
Joined: Wed Sep 12, 2007 12:42 pm
Location: Modesto, CA

Re: APOD: Brisbane Sunset Moonset (2014 May 01)

Post by geckzilla » Thu May 01, 2014 3:00 pm

Oblivious wrote:Umm... isn't the moon suppose to be in opposition for the sun to cast a shadow? Just saying.
The moon is in opposition from the sun during a full moon or lunar eclipse. The moon is in conjunction with the sun for a new moon or solar eclipse.
Just call me "geck" because "zilla" is like a last name.

User avatar
geckzilla
Ocular Digitator
Posts: 8967
Joined: Wed Sep 12, 2007 12:42 pm
Location: Modesto, CA

Re: APOD: Brisbane Sunset Moonset (2014 May 01)

Post by geckzilla » Thu May 01, 2014 3:09 pm

eladnitram wrote:In comparing this image to yesterday's APOD, it occurs to me that one of the images is "flipped." Since totality didn't occur until after sunset in Australia, it doesn't seem possible that the moon would have eclipsed the left/upper left of the sun in Brisbane and then the upper right of the sun by the time it set in Adelaide, 1300 miles to the west. Am I missing something?
That's a good observation, but neither image is flipped. The moon does not take a straight path across the sun and the location does make a difference for how much of the sun is covered by the moon during an eclipse. I recommend using some planetarium software (I use Stellarium, it's free and pretty easy to use) to simulate views of various events from different places on the planet. That is the easiest and most intuitive way to get a feel for how the moon and sun were positioned for these two pictures to be possible.
Just call me "geck" because "zilla" is like a last name.

User avatar
Chris Peterson
Abominable Snowman
Posts: 14391
Joined: Wed Jan 31, 2007 11:13 pm
Location: Guffey, Colorado, USA

Re: APOD: Brisbane Sunset Moonset (2014 May 01)

Post by Chris Peterson » Thu May 01, 2014 3:15 pm

Oblivious wrote:Umm... isn't the moon suppose to be in opposition for the sun to cast a shadow? Just saying.
How can the Sun cast a shadow at all? It is the light source. The Earth always casts a shadow. The Moon always casts a shadow except during total lunar eclipses.
Chris

*****************************************
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com

User avatar
geckzilla
Ocular Digitator
Posts: 8967
Joined: Wed Sep 12, 2007 12:42 pm
Location: Modesto, CA

Re: APOD: Brisbane Sunset Moonset (2014 May 01)

Post by geckzilla » Thu May 01, 2014 3:21 pm

Chris Peterson wrote:The Moon always casts a shadow except during total lunar eclipses.
The moon casts a meager shadow during a total lunar eclipse now thanks to our city lights.
Just call me "geck" because "zilla" is like a last name.

User avatar
Chris Peterson
Abominable Snowman
Posts: 14391
Joined: Wed Jan 31, 2007 11:13 pm
Location: Guffey, Colorado, USA

Re: APOD: Brisbane Sunset Moonset (2014 May 01)

Post by Chris Peterson » Thu May 01, 2014 3:50 pm

geckzilla wrote:
Chris Peterson wrote:The Moon always casts a shadow except during total lunar eclipses.
The moon casts a meager shadow during a total lunar eclipse now thanks to our city lights.
Well, yes. But if we're looking at shadows of light sources other than the Sun, both the Earth and Moon cast thousands from individual stars. Even the Sun casts shadows from other stars.
Chris

*****************************************
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com

User avatar
geckzilla
Ocular Digitator
Posts: 8967
Joined: Wed Sep 12, 2007 12:42 pm
Location: Modesto, CA

Re: APOD: Brisbane Sunset Moonset (2014 May 01)

Post by geckzilla » Thu May 01, 2014 5:13 pm

Holy photons, Batman. The Universe is practically made of shadows.
Just call me "geck" because "zilla" is like a last name.

BillBixby
Science Officer
Posts: 118
Joined: Tue Jul 10, 2012 6:57 pm

Re: APOD: Brisbane Sunset Moonset (2014 May 01)

Post by BillBixby » Thu May 01, 2014 7:55 pm

geckzilla wrote:Holy photons, Batman. The Universe is practically made of shadows.
Shadows, what dark matter is all about. :wink:

User avatar
geckzilla
Ocular Digitator
Posts: 8967
Joined: Wed Sep 12, 2007 12:42 pm
Location: Modesto, CA

Re: APOD: Brisbane Sunset Moonset (2014 May 01)

Post by geckzilla » Thu May 01, 2014 8:33 pm

BillBixby wrote:
geckzilla wrote:Holy photons, Batman. The Universe is practically made of shadows.
Shadows, what dark matter is all about. :wink:
Turns out dark matter is just one big bug in the system where a mass object continues invisibly on its trajectory in place of were a photon was absorbed / ended. Biggest memory leak ever.
Just call me "geck" because "zilla" is like a last name.

User avatar
Beyond
500 Gigaderps
Posts: 6889
Joined: Tue Aug 04, 2009 11:09 am
Location: BEYONDER LAND

Re: APOD: Brisbane Sunset Moonset (2014 May 01)

Post by Beyond » Thu May 01, 2014 9:10 pm

Holy big bug, Batman. Does the Dark really matter?
To find the Truth, you must go Beyond.

FloridaMike
Science Officer
Posts: 413
Joined: Fri Nov 04, 2011 2:21 pm
Location: Florida, USA

Re: APOD: Brisbane Sunset Moonset (2014 May 01)

Post by FloridaMike » Thu May 01, 2014 9:46 pm

geckzilla wrote:
BillBixby wrote:
geckzilla wrote:Holy photons, Batman. The Universe is practically made of shadows.
Shadows, what dark matter is all about. :wink:
Turns out dark matter is just one big bug in the system where a mass object continues invisibly on its trajectory in place of were a photon was absorbed / ended. Biggest memory leak ever.
Maybe that is what is wrong with Otto...
Certainty is an emotion. So follow your spindle neurons.

User avatar
Nitpicker
Inverse Square
Posts: 2689
Joined: Fri Sep 20, 2013 2:39 am
Location: S27 E153

Re: APOD: Brisbane Sunset Moonset (2014 May 01)

Post by Nitpicker » Fri May 02, 2014 2:26 am

geckzilla wrote:
eladnitram wrote:In comparing this image to yesterday's APOD, it occurs to me that one of the images is "flipped." Since totality didn't occur until after sunset in Australia, it doesn't seem possible that the moon would have eclipsed the left/upper left of the sun in Brisbane and then the upper right of the sun by the time it set in Adelaide, 1300 miles to the west. Am I missing something?
That's a good observation, but neither image is flipped. The moon does not take a straight path across the sun and the location does make a difference for how much of the sun is covered by the moon during an eclipse. I recommend using some planetarium software (I use Stellarium, it's free and pretty easy to use) to simulate views of various events from different places on the planet. That is the easiest and most intuitive way to get a feel for how the moon and sun were positioned for these two pictures to be possible.
From Adelaide, the greatest extent of the eclipse was observed about and hour before sunset.

User avatar
DavidLeodis
Perceptatron
Posts: 1169
Joined: Mon May 01, 2006 1:00 pm

Re: APOD: Brisbane Sunset Moonset (2014 May 01)

Post by DavidLeodis » Fri May 02, 2014 12:06 pm

geckzilla wrote:Holy photons, Batman. The Universe is practically made of shadows.
At 14 plus billion years old the Universe is probably now only a shadow of its former self! :)

eladnitram
Asternaut
Posts: 2
Joined: Thu May 01, 2014 1:56 pm

Re: APOD: Brisbane Sunset Moonset (2014 May 01)

Post by eladnitram » Fri May 02, 2014 12:54 pm

Nitpicker wrote:
geckzilla wrote:
eladnitram wrote:In comparing this image to yesterday's APOD, it occurs to me that one of the images is "flipped." Since totality didn't occur until after sunset in Australia, it doesn't seem possible that the moon would have eclipsed the left/upper left of the sun in Brisbane and then the upper right of the sun by the time it set in Adelaide, 1300 miles to the west. Am I missing something?
That's a good observation, but neither image is flipped. The moon does not take a straight path across the sun and the location does make a difference for how much of the sun is covered by the moon during an eclipse. I recommend using some planetarium software (I use Stellarium, it's free and pretty easy to use) to simulate views of various events from different places on the planet. That is the easiest and most intuitive way to get a feel for how the moon and sun were positioned for these two pictures to be possible.
From Adelaide, the greatest extent of the eclipse was observed about and hour before sunset.
Nice animation here shows the path of the eclipse shadow which helps to see why the view from Adelaide was different than from Brisbane:

http://en.wikipedia.org/wiki/Solar_ecli ... l_29,_2014

Also, cool use of Google maps to show the view of the eclipse from any position at various times:

http://xjubier.free.fr/en/site_pages/so ... ag=1&Max=1

Both help to see that the view was differnt, even from geographically close positions.