|
|
|
Thread Tools | Display Modes |
#11
|
|||
|
|||
Full phase Earth from the lunar surface?
Dear Barry Schwarz:
On Monday, May 19, 2014 5:51:19 PM UTC-7, Barry Schwarz wrote: .... Some have posited that the apparent increase in size when the moon is near the horizon is due to atmospheric refraction. This is incorrect. Others have posted that this is not the case. I have no idea which is correct but - Don't need to go to the Moon for that determination. Take a yard or meter stick, and a small metal disk (say a US quarter). Place the stick below your eye, aimed towards the Moon, note the distance the disk needs to be placed to just barely see the Moon around the disk. Repeat when the Moon is near the horizon, and then higher. It will be the same distance in all cases.. David A. Smith |
#12
|
|||
|
|||
Full phase Earth from the lunar surface?
Nice description here of the illusion: Why does the moon look so much bigger when it is near the horizon? http://science.howstuffworks.com/question491.htm Notice the image on this page shows such size illusions can persist even in images. A nice video description of the illusion: The moon illusion - Andrew Vanden Heuvel. http://ed.ted.com/lessons/the-moon-i...-vanden-heuvel And this video shows optical illusions don't have to be viewed "live". They can persist even in videos and photographs: Ramachandran - Ames room illusion explained. https://www.youtube.com/watch?v=Ttd0YjXF0no Bob Clark ================================================== ======= "Robert Clark" wrote in message ... The full Moon sometimes looks huge when it's low on the horizon. I was wondering if the same effect would occur on the Moon if we saw a full phase Earth from the lunar surface. There haven't been many pictures taken from the surface of the Moon that show the Earth. Here's one: http://moonpans.com/prints/CernanEarth.jpg The Earth can look pretty large low on the horizon from lunar orbit even when not at full phase as shown by this Apollo 11 image taken from orbit: http://www.astronautix.com/graphics/0/10075247.jpg Are there images taken from the lunar surface either by robots or manned missions that show the Earth rise at or close to full phase? Nice article by Dr. Pauls Spudis: Earth Rising. Earth as seen from the Moon is always in the same place – true or false? It depends. By Paul D. Spudis May 15, 2014 Quote:
I wonder if a Google Lunar X-Prize entrant could land at one of the locations where Earthrise would be visible. Bob Clark |
|
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Recurrence of a lunar phase | Michael | Research | 2 | November 28th 05 09:38 PM |
Recurrence of a lunar phase | Michael | Astronomy Misc | 2 | November 27th 05 07:56 PM |
First full mosaics of Titan's surface | Jacques van Oene | News | 0 | May 15th 05 06:20 PM |
need lunar phase algorithm | Marty | Misc | 1 | August 11th 03 03:58 PM |