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Jul 20th, 2008, 1:25am
   Mischel Internet Security Forum
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   Earth at night		 « Previous topic | Next topic »
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claire
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Earth at night
« on: Oct 1st, 2006, 2:35am »		 Quote Quote  Modify Modify
http://antwrp.gsfc.nasa.gov/apod/astropix.html
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Claire
markov
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Re: Earth at night
« Reply #1 on: Oct 8th, 2006, 11:28am »		 Quote Quote  Modify Modify
Till now the speed of the earth is not fully answered question ! Anyhow, good post !
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doubledown
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Re: Earth at night
« Reply #2 on: Oct 9th, 2006, 10:16am »		 Quote Quote  Modify Modify
on Oct 8th, 2006, 11:28am, markov wrote:
Till now the speed of the earth is not fully answered question !

 
I'd guess that the "speed of the earth" is known extremely accurately otherwise it wouldn't be possible to send rovers to Mars!!  Wink
 
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doubledown
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Re: Earth at night
« Reply #3 on: Oct 10th, 2006, 5:18am »		 Quote Quote  Modify Modify
on Oct 8th, 2006, 11:28am, markov wrote:
Till now the speed of the earth is not fully answered question !

 
markov dude - prepare to be amazed!!  Shocked
 
I am about to calculate the approximate "speed of the earth" for you using no more than elementary maths and a couple of items of general knowledge  Shocked  Shocked
 
Here is the maths i will be using, no more no less:
 
Circumference of circle = 2 x Pi x radius of circle
 
Here is the general knowledge i will be using:
 
number of days in a year: generally accepted as 365
 
approx. earth - sun distance: 96 million miles
 
path of earth round sun: circular-ish
 
Ok - are you ready?? - hold on to your hat! - here we go!!!
 
In one year, the earth completes a circular orbit round the sun, with radius 96 million miles, therefore the earth travels a distance of:
 
2 x Pi x 96 million miles  
 
It travels this distance in 365 days.
 
Therefore the approximate "speed of the earth" round the sun is:
 
(2 x Pi x 96 million miles)/365 days
 
For "ease of calculation" I'll say 2 Pi equals 6 and 96 million is approx 100 million, so the earth travels approx 600 million miles in 365 days.
 
I was going to kick it old skool and do long division here - but I can't remember how to do it  Embarassed
 
Therefore I will resort to my trusty calculator for the final steps:
 
600 million miles in 365 days = approx 1.6 million miles per day = 1.6 million miles per 24 hours  
 
= approx 66 thousand miles per hour
 
Voila!!  Grin
 
 
 
 
 
 
 
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doubledown
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Re: Earth at night
« Reply #4 on: Oct 10th, 2006, 5:23am »		 Quote Quote  Modify Modify
Would that be about Mach 100?? - sounds kinda cool doesn't it!  Smiley
« Last Edit: Oct 10th, 2006, 5:24am by doubledown » IP Logged
doubledown
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Re: Earth at night
« Reply #5 on: Oct 10th, 2006, 9:28am »		 Quote Quote  Modify Modify
Ladies and Gentlemen we are cruising in solar orbit at Mach 100 - relax and enjoy the ride, we expect this trip to last a couple of billion years or so.
 
In the unlikely event of an emergency ... um, okay we're still working on that one ....  
 
 Wink
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