Search found 10 matches

by black_pignouf
Wed Oct 12, 2016 9:32 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1738:"Moon Shapes"
Replies: 66
Views: 14653

Re: 1738:"Moon Shapes"

Maybe my favourite moonish thing is how the path of the moon is similar to the path of the sun in a phase-dependent way: the full moon is doing something like the sun will be doing in six months, whereas the new moon is roughly on the sun's current path, and everything in between is in between - a ...
by black_pignouf
Mon Sep 26, 2016 1:43 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1738:"Moon Shapes"
Replies: 66
Views: 14653

Re: 1738:"Moon Shapes"

@boilerplate: You're right that the full moon is much brighter than any landscape at night when the moon is high above the horizon, but when it's close to the horizon, its light must go through so much atmosphere that it gets much dimmer, and gets a brightness comparable to the other objects in the ...
by black_pignouf
Mon Sep 26, 2016 1:38 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1738:"Moon Shapes"
Replies: 66
Views: 14653

Re: 1738:"Moon Shapes"

@boilerplate: Why do you include this picture? Do you think it's fake? It's not. The trick to get a huge moon in comparison to buildings is to be far far away from those buildings (-> buildings appear smaller, moon stays the same), and zoom as much as you can. That's why the photographer (Michael Ma...
by black_pignouf
Mon Sep 26, 2016 9:12 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1738:"Moon Shapes"
Replies: 66
Views: 14653

Re: 1738:"Moon Shapes"

@J L : During a solar eclipse, the bright part cannot be the moon, because solar eclipses only happen during new moons (i.e. moon is fully black). So #4 can be either : * crescent moon during the day in the northern tropic. bright part is the moon, sky isn't black. * shortly after/before a total sol...
by black_pignouf
Mon Sep 26, 2016 8:58 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1738:"Moon Shapes"
Replies: 66
Views: 14653

Re: 1738:"Moon Shapes"

Is it me or are the "stars" inside the "moon" circle in the last picture a bit too sparse? When you look at the moon with binoculars or a telescope, the image is so bright that you cannot really see any dim celestial object around it. Aside from the fact that you cannot see thro...
by black_pignouf
Mon Sep 26, 2016 8:46 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1738:"Moon Shapes"
Replies: 66
Views: 14653

Re: 1738:"Moon Shapes"

#4 is totally possible, during the day around the northern tropic.
For example the 5th of October 2016 in central America.
moon_tropic.png

It won't be pitch black around it, but the constrast is high enough that it looks a lot like the drawing.
by black_pignouf
Thu Oct 02, 2014 11:24 am UTC
Forum: What If?
Topic: What-If 0114: "Antimatter"
Replies: 52
Views: 16302

Re: What-If 0114: "Antimatter"

Did you read the what-if? All of it was based on this scenario.

So, you might as well use a car or an elephant to rule out this possibility.
You don't need a telescope. Am I right?
by black_pignouf
Thu Oct 02, 2014 10:57 am UTC
Forum: What If?
Topic: What-If 0114: "Antimatter"
Replies: 52
Views: 16302

Re: What-If 0114: "Antimatter"

However, it's easy to use a telescope to rule out one possibility: That everything in the sky is antimatter.

I don't understand the logic behind it.
I read somewhere that anti-photons are just normal photons. Why would the telescope catch fire if everything in the sky is antimatter?
by black_pignouf
Tue Jan 21, 2014 12:04 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1319: "Automation"
Replies: 58
Views: 16592

Re: 1319: "Automation"

Thanks Morgan, it makes sense now.
by black_pignouf
Mon Jan 20, 2014 9:39 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1319: "Automation"
Replies: 58
Views: 16592

Re: 1319: "Automation"

Maybe I'm stupid, but I don't understand the 1st graph.
Shouldn't the automation curve fall down to zero in order to save time, or at least represent less work than the original task?
Shouldn't the two curves cross somewhere?
If automation isn't worth it in theory, it sure won't in reality.

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