On Wed, 22 Mar 2006 22:14:00 -0000, "George Dishman" <[email protected]>
>"Henri Wilson" <HW@..> wrote in message
>> On Sat, 18 Mar 2006 18:36:33 -0000, "George Dishman"
>> <[email protected]>
>>>"Henri Wilson" <HW@..> wrote in message
>>>> there is very little diference between e=0 and e=0.05
>>>If your code is wrong, all of the effect at e=0.05
>>>may be due to the error. You need to sort the bug.
>> You're becoming boring George.
>> The error is merely in the scaling of the blue velocity curve.
>> It has been fixed.
>Does it now give a valid scale for the curve?
Yes. It doesn't go offscale.
The size is not importanrt. It is the shape and phase that matter here.
>> My program uses a very efficient method to determine velocity and
>> direction of
>> movement around any orbit. It stores all the info in several large arrays.
>> secret of my program is that it uses equal time steps not equal angles. It
>> doesn't use elliptical equations. It relies solely on a=GM/r^2. Circular
>> are handled differently. As one would expect, there is little difference
>> brightness curves for e= 0 and e= 0.05
>> Normally 20000 sample points is quite adequate when working below the
>> distance. Increasing that to 60000 makes virtually no difference to
>Given the recent discussion on extinction
>distance, I might try 0.0047 light years
>anyway but it will be at the weekend, I have
>too much else to do tonight.
Extinction in remote space is something we can only speculate about at this
My program might be able to reveal a few facts..