Called a Glory
Notice the many rings
We noticed this out the plane window on our way to Tucson Arizona.
Its called a Glory. Look for the shadow of your airplane
and you just might get lucky and see it yourself. This photo of
mine is published in the physics journal of the
Roland Eotvos Physical Society of Budpaest). Its also on
this site where the science behind this glory phenomenon is explained.
The center of the glory is along a direct line between the sun
and my eye, or at what is called the anti-solar point. To prove this look at the shadow, we sat right behind
the wing on the right side of the plane.
A neat optical illusion: as the plane rose, its shadow became smaller
while the plane-bow covered the same angle (obvious reasons). Seeing the
plane-bow stretch over the faraway clouds made it appear much much
larger than it actually was. See
this optical illusion
for an explanation of why.
This picture has been published in the physics
journal of the
Roland Eotvos Physical Society of Budpaest,
This is a photo of the lunar eclipse we had some time ago. I didn't
doctor up the picture but it really
didn't look anywhere near this red in real life. I was pretty confused until I remembered that color vision is limited in
low light. I googled "rods and cones" and found furthermore that
"the rod sensitivity is shifted toward shorter wavelengths. " since rods
are the ones that give you night vision, and red has a 'longer'
wavelength, the moon did not appear very red to my eye. On the
other hand, the camera was not effected in any way by the darkness so it had a 'truer'
picture of the moon.
It appears red for the same reason that sunsets are red. If you
were on the moon, Earth would have a big sunset ring around it.
Notice the bright spot around the camera. This effect (named the
Opposition Effect) happens whenever you have a long shadow. The
degree depends heavily on the type of surface. Its neat how the bright
spot is centered around the camera lens (I am holding the camera above
my head in one picture). There is a nice explanation of this
A coke bottle filled with water then frozen.
I've always wanted to do this!!!
We all know that glaciers are rivers of ice, this is because ice under pressure
acts like a liquid. The coke bottle is designed to hold pressure so when
the water froze and tried to expand, the liquid ice oozed out the top of the
bottle like playdough pushed through a spaghetti machine. Of course once
outside the bottle (there was much lower pressure) it solidified to the shape of
the nozzle, a cylinder.
It is worth noting that the bottle cracked before all the water inside froze.
This is because the outside edges froze before the center. This centimeter
thick layer of forming ice had the structural strength of an arch with outward
force. An oversimplified horizontal
slice is shown, the black arrows show ice expanding, the red arrows are the
resulting force outward. They are not proper vectors, I'd need a limit to
do that anyway (its out of the scope of this site. Ask me and I'll
Water being poured onto a hot hot plate. It was
amazing, the little droplets would bounce up and down like rubber balls
until they disappeared.
I have an idea why they didn't just sit on the pan and boil, but its
really just a guess. On impact the bottom layer obviously boiled
instantly spraying the water. That makes sense. Since the
drops were tiny, surface tension was strong (you know, small soup
bubbles are always more spherical than those huge clumpy ones).
When the bottom of the water-sphere hit the plate, there may have been a
tiny explosion of water vaporizing, propelling the tiny drop directly
up. It may not be right, but for now I can sleep at night.
I took this picture at night with a long exposure. When the cars
drove by I spun the camera on its tripod. I haven't gotten around to
making the equation to graph this but it shouldn't be too hard to do in
polar. If I hear some interest or encouragement, I'll do it.