Starship Asterisk*

> No, iridescent clouds don't jump around that way. They are stable for minutes or longer. Read the main entry again, I believe you've missed the entire point: the cloud in the videos aren't jumping. The sudden motions in all the various different videos are obviously not motions of clouds. (Especia...

What the heck is it my computer blocks youtube CAN ANYONE TELL ME WHAT IT LOOKS LIKE BECAUSE I LIKE TO SEE THE ASTRONOMY PICTURE OF THE DAY EVERYDAY HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! :cry: :cry: :cry: :cry: :cry: The video shows bright bands ?cirrus? next to a thunderhead, and the bright...

IMHO, and in concordance with seasoned atmospheric optics observers, I must say the jumping sensation CANNOT be a sundog, Again, "sundog" refers to the first video in the list of six in the first link. as there is no color at all. My question would be, whether the vid has been taken throu...

The NWS is in the process of developing some products from this system that compares vertical polarization with horizontal polarization of both ice crystals and precipitation. So far, NWS research has found sharp bands of contrasting values where dual-polarized radar beams intersect ice crystals ar...

Is the bright spot in the video actually a sundog Nope, it seems to be a Pileus cloud above a thunderhead. "Sundog" refers to one of the videos listed on http://amasci.com/amateur/sundog.html, specifically this one: http://www.youtube.com/watch?v=fEiQKOLXU8Y I'd think that in general, if ...

And about planar contrail shadows: they arise and vanish in a space of minutes. The duration of the apparent contrail shadow would depend on the apparent drift speed of the contrail. If the contrail was fairly low, and the wind at that altitude was fairly strong, then the dark stripe might be visib...

And about planar contrail shadows: they arise and vanish in a space of minutes. They become visible when the observer is inside the plane of darkness (the planar region where there is a lack of scattered sunlight from the air.) They vanish again when the observer is no longer inside the shadow regio...

> Yes, of course it can be faked. But if you read the APOD description, > > "The photographer insists that the streak and flash on the above image > has not been created digitally." As with any photo of a controversial phenomenon, the reputability of the photographer becomes paramount. If ...

If the shadow was sourced at the lamp, then the shadow would not appear as a line with parallel edges. Depending on the distance between the light source and the opaque object, the shadow would spread out more or less. Also, if the distant lamp caused that shadow, it would be caused by a lack of sca...

Another photo of glass-bead rainbow
http://www.geocities.com/CapeCanaveral/ ... t.html#TLP

The "underground sidewalk-rainbows" effect also works great at night under a single streetlight. When I develop enough ambition, I go and sprinkle a bit of the stuff on the sidewalk surrounding the bronze Jimi Hendrix statue on Seattle's Broadway Avenue: http://www.vrseattle.com/html/vrvie...

DOES ANYONE WANT A COUPLE OF POUNDS OF GLASS MICRO-BEADS? With a bag of beads, you can reproduce Dr. Lewin's photo at any time. A sunny day is required though. I still have about 100LBS of the stuff out in my garage; bought for distribution at the monthly meeting of the Seattle Weird Science Salon. ...