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visits member for 3 years
seen Jul 17 at 16:47

Jul
13
awarded  Yearling
May
11
comment Why can I turn light red or blue by holding my finger up to it?
@CarlWitthoft No, no glasses.
May
11
comment Why can I turn light red or blue by holding my finger up to it?
@borilla When you bring your finger very close (a couple of inches) to your eye, the edge of your finger blurs. You should be peering at the dark/light boundary through that blurring. I found it worked best looking at a metal blind obscuring a very bright sunny blue sky, at a distance of a meter or two. The coloring is more visible the brighter the background light is.
May
11
asked Why can I turn light red or blue by holding my finger up to it?
Jan
21
awarded  Nice Answer
Jan
21
awarded  Necromancer
Jul
28
awarded  Favorite Question
Jul
23
awarded  Teacher
Jul
13
awarded  Yearling
Jul
2
awarded  Curious
Jun
22
accepted How can I derive this Hamiltonian?
Jun
22
comment How can I derive this Hamiltonian?
So when I take a partial derivative with respect to $z$ or $p$, $t$ is considered to be constant?
Jun
20
asked How can I derive this Hamiltonian?
Jun
20
comment How did Eratosthenes know the suns rays are parallel?
Aristarchus of Samos: The Ancient Copernicus by Thomas Heath contains the only translation of On the Sizes and Distances I could find, for future reference.
Jun
20
accepted What do the derivatives in these Hamilton equations mean?
Jun
20
comment What do the derivatives in these Hamilton equations mean?
@jinawee My question is more computational/mathematical, but yes.
Jun
19
asked What do the derivatives in these Hamilton equations mean?
May
6
comment Rocky Planet in the center of System
Until your second paragraph, it seemed more like you were asking if there could be rocky objects in a galaxy which don't orbit any star.
Apr
10
awarded  Notable Question
Mar
22
awarded  Good Question