Register | Sign In


Understanding through Discussion


EvC Forum active members: 63 (9162 total)
3 online now:
Newest Member: popoi
Post Volume: Total: 916,385 Year: 3,642/9,624 Month: 513/974 Week: 126/276 Day: 0/23 Hour: 0/0


Thread  Details

Email This Thread
Newer Topic | Older Topic
  
Author Topic:   The moons, eclipses, and timing
lyx2no
Member (Idle past 4736 days)
Posts: 1277
From: A vast, undifferentiated plane.
Joined: 02-28-2008


Message 101 of 112 (533263)
10-29-2009 3:38 PM
Reply to: Message 99 by kbertsche
10-29-2009 11:14 AM


Red Moon Rising
They would almost certainly have noticed an unusually reddish moonrise.
There would not have been a red moon for them to notice. The red moon is caused by the Earth's atmosphere transmitting a small amount of the light that hits it around and filling in the Earth's shadow slightly. Most of the longer wavelengths (blue) is left behind, scattered for us to see in the sky. The operative words, however, are "small' and "slightly"; very little light is carried round into the shadow and even a small amount of full sun light blinds us to the extra red component.

It's not the man that knows the most that has the most to say.
Anon

This message is a reply to:
 Message 99 by kbertsche, posted 10-29-2009 11:14 AM kbertsche has replied

Replies to this message:
 Message 102 by Calypsis4, posted 10-29-2009 4:21 PM lyx2no has not replied
 Message 104 by kbertsche, posted 10-29-2009 6:15 PM lyx2no has replied

  
lyx2no
Member (Idle past 4736 days)
Posts: 1277
From: A vast, undifferentiated plane.
Joined: 02-28-2008


Message 105 of 112 (533280)
10-29-2009 6:33 PM
Reply to: Message 104 by kbertsche
10-29-2009 6:15 PM


Re: Red Moon Rising
Why is "full sun light" relevant?
Some portion of the moon's surface receiving full sunlight, not the observers.
AbE: Actually, let me modify that somewhat. Full sunlight is an over statement. I should have said direct sunlight. Even if the Sun is only peaking around the Earth a little bit (Moon in the Earth's penumbra) the redness is washed out.
Edited by lyx2no, : Correct myself.
Edited by lyx2no, : Correct the correction.

It's not the man that knows the most that has the most to say.
Anon

This message is a reply to:
 Message 104 by kbertsche, posted 10-29-2009 6:15 PM kbertsche has replied

Replies to this message:
 Message 107 by kbertsche, posted 10-29-2009 10:29 PM lyx2no has replied

  
lyx2no
Member (Idle past 4736 days)
Posts: 1277
From: A vast, undifferentiated plane.
Joined: 02-28-2008


Message 108 of 112 (533308)
10-29-2009 11:38 PM
Reply to: Message 107 by kbertsche
10-29-2009 10:29 PM


Re: Red Moon Rising
But if part were in the unbra, this part should appear reddish.
Only if the moon is fully within the umbra does it appear red. That's the point of my modification. If even a tiny part of the Sun peaks around the Earth it floods the moon with so much light the small amount of red cast into the shadow is insignificant, and one sees a gray cum black moon.
For the Moon to be seen as red the residents of the Levant would have had to have been observing a total lunar eclipse or some other, unrelated event. And even at that they'd also need time for their eyes to be dark adjusted for the red tinge to register.
A Moon low on the horizon can appear red with non dark-adjusted eyes because the full amount of light reflected off of the Moon is being filtered by the atmosphere as it travels from the Moon to the observer. There's a whole heck of a lot more red light in the light reflected off of the Moon then there is in the dribble that makes it round the Earth to tinge the umbra. And We're no done yet, there are further losses as it bounces back and is filtered by the atmosphere again.
Another explanation for the red Moon will have to be found. My pet is that high drama is a Bible writers groove.

It's not the man that knows the most that has the most to say.
Anon

This message is a reply to:
 Message 107 by kbertsche, posted 10-29-2009 10:29 PM kbertsche has seen this message but not replied

  
lyx2no
Member (Idle past 4736 days)
Posts: 1277
From: A vast, undifferentiated plane.
Joined: 02-28-2008


Message 111 of 112 (533423)
10-30-2009 4:39 PM
Reply to: Message 110 by DevilsAdvocate
10-30-2009 4:14 PM


Re: Serious subjects
And you're getting coal in your stocking. So there.

It's not the man that knows the most that has the most to say.
Anon

This message is a reply to:
 Message 110 by DevilsAdvocate, posted 10-30-2009 4:14 PM DevilsAdvocate has not replied

  
Newer Topic | Older Topic
Jump to:


Copyright 2001-2023 by EvC Forum, All Rights Reserved

™ Version 4.2
Innovative software from Qwixotic © 2024