Jumpday 20.7.2006

pooca · Post by **pooca** » Wed Jul 19, 2006 6:37 pm

This is a reminder for all of you to jump tomorrow

http://www.worldjumpday.org/

JP Simões · Post by **JP Simões** » Wed Jul 19, 2006 6:58 pm

They've even got water-resistent stickers!

Fons · Post by **Fons** » Wed Jul 19, 2006 7:36 pm

I think it's better to let those people jump at the same time, which doesn't seem to be their plan.....

androl · Post by **androl** » Wed Jul 19, 2006 10:24 pm

okay, 600 million people, equally distributed all over the world, will jump into the air at the same time. This will give the earth 600 million impulses p1(i) directed to the center of the earth, all neutralizing each other. Impulse change = sum(p1(i),i=1...600000000) = 0
Then the earth pulls back the jumpers, being pulled back to the jumpers by means of reactio. This gives the earth 600 million impulses p2(i) directed away from the center, with double amount of the impulses p1(i): p2(i)=-2*p1(i), so sum(p2(i),i=1...600000000) = -2*sum(p1(i),i=1...600000000) = -2*0
When the jumpers come back to the ground, they give the earth impulses p3(i)=p1(i), which will sum up to 0 again.

So the overall impulse change of the earth will be 0 + -2*0 + 0 = 0*0

This impulse change of 0*0 will catapult the earth away from the solar system and will cause everlasting winter, so please don't do it!

Fons · Post by **Fons** » Wed Jul 19, 2006 10:41 pm

As I said, the website doesn't make people jump at the same time. Because the say you have to jump in a different amount of hours when your from another time zone

micro · Post by **micro** » Wed Jul 19, 2006 10:55 pm

Whatever the effect might be, you'll probably have to take into account the large area covered by the Pacific ocean, where people cannot jump.

androl · Post by **androl** » Wed Jul 19, 2006 11:05 pm

I guess the timer at the bottom is incorrect. It is probably based on your time settings, so if you live in Australia, the timer will tell you the correct time for Australian time zones.
if I click Berlin, it says 12:39:13 and the counter says 14:35 hours, which will be 13:39:13

JP Simões · Post by **JP Simões** » Wed Jul 19, 2006 11:05 pm

Is it just me or there's something wrong with the clock? The jump should occur in Lisbon at local time 11:39, there are now 13h36m remaining. But if I change to Monaco, the jump will occur at local time 12:39 (which is the same moment, as Monaco belongs to CET, and Portugal doesn't), which is 14h36m away!

androl · Post by **androl** » Wed Jul 19, 2006 11:07 pm

so at your computer the times are correct, because you have now 10:07 PM

JP Simões · Post by **JP Simões** » Wed Jul 19, 2006 11:09 pm

My guess is that the countdown time is based on the calculation (local time - NOW(), without convertions whatsoever) Maybe the server is based on GMT?

androl · Post by **androl** » Wed Jul 19, 2006 11:10 pm

someone from Australia should post

... I'll ask someone

JP Simões · Post by **JP Simões** » Wed Jul 19, 2006 11:11 pm

Do we have Australian users? And maybe they're asleep right now (except those from the East coast).

We do have this one from Tonga, yet it seems as it's a ghost user.

androl · Post by **androl** » Wed Jul 19, 2006 11:20 pm

I asked on another forum
but they don't answer yet, they only discuss the thing

JP Simões · Post by **JP Simões** » Wed Jul 19, 2006 11:25 pm

Let's just wait a few hours and see if it worked.

androl · Post by **androl** » Wed Jul 19, 2006 11:26 pm

okay, a user that is 8 hours before europe answered the timer shows "6 hours"
so the timer is based on UTC+1 (Portuguese summer time)