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Moon phase !!!!!

Posted: Thu Jun 17, 2010 6:50 pm
by portaleazzurro
Right now on my Yowindow is indicated: Moon phase = 25%.
But the first quarter moon is not the day after tomorrow? :roll:

Re: Moon phase !!!!!

Posted: Fri Jun 18, 2010 1:08 pm
by par
Hey, Franco!

It is 35% in my YoWindow.
An as far as I understand the Moon phase is the same around the planet.
Am I right?

Re: Moon phase !!!!!

Posted: Fri Jun 18, 2010 7:11 pm
by portaleazzurro
par wrote:Hey, Franco!

It is 35% in my YoWindow.
An as far as I understand the Moon phase is the same around the planet.
Am I right?
Pavel, in this moment my Yowindow says: Moon phase: 36%.
The calendar shows:
Tomorrow the first quarter moon.
On Saturday 26 indicates full moon: is 100%?
What is the percentage of the first quarter?
What is the percentage of the full moon?
What is the percentage of last quarter?
What is the percentage of the new moon?

Thank you.

Re: Moon phase !!!!!

Posted: Fri Jun 18, 2010 7:29 pm
by countryroads
I just looked at Wunderground. It shows all of the moon phases and their dates. It shows first quarter on June 19th. But it also shows that the moon is currently 45% illuminated.

Hopefully this answers some questions.

Marty

Re: Moon phase !!!!!

Posted: Sat Jun 19, 2010 12:21 pm
by portaleazzurro
Wunderground me back on a lunar phase of 53%.
On my Yowindow moon phase is indicated by 47%.
Why this difference?

When the moon is full, the percentage will be 100%?

Re: Moon phase !!!!!

Posted: Sat Jun 19, 2010 1:25 pm
by portaleazzurro
I managed to make two screens.
ImageImage

Re: Moon phase !!!!!

Posted: Sat Jun 19, 2010 3:25 pm
by FvE
Hi,

For what it's worth the moonphase (percentage) differs from time to time during the day. It wil change for more than 10% in 24 hours.
Maybe this can clarify things for you: http://astro.unl.edu/naap/lps/animations/lps.html
Look at the percentages when you take steps at 1 hour at the time.

I don't know where YoWindow takes the lunar information from, but I'm pretty sure it's a fair average at some point during the day.

Even when you google for it you will find all kinds of values varying from 45 to 55% for today (first quarter).

I've looked up the value at wunderground about 4 hours later than you did and it gave me 55%:
Moonphase Wunderground.jpg
Moonphase Wunderground.jpg (18.69 KiB) Viewed 10015 times
(This is in Amsterdam Holland, local time)

Hope this may be of help.
Fred

Edit: The actual first quarter phase today was at 05:29 Universal Time, 06:29 Local Time for both you and me (I think).

Re: Moon phase !!!!!

Posted: Sat Jun 19, 2010 8:06 pm
by par
Thank you Fred, exactly!

Re: Moon phase !!!!!

Posted: Sat Jun 19, 2010 9:35 pm
by portaleazzurro
Thanks!
I begin to understand !
;) ;) ;)

Re: Moon phase !!!!!

Posted: Sun Jun 20, 2010 9:55 pm
by FvE
YoWelcome :D