Re: [GZG] Satellite imagery

Sure, but my point is that there are other, more important reasons than
range that make geosynchronous orbits sub-optimal for recon satellites.
The fact that you are fixed above a given point is a big negative.
The fact that most of the planet is either at a bad viewing angle or
is completely occulted is also a big negative.
Long range is just another nail in the coffin, IMO.

Cheers,
Tony C.

On 10-Mar-06, at 5:40 PM, Eric Foley wrote:

> Well, the exact PSB you decide to use isn't really that important.  At

> some point, one has to keep in mind that we're discussing a sci-fi 
> future where the problem of how to travel faster than light -- which 
> current physics holds to be either impossible outside of maybe the 
> outlandish theory of dropping through a singularity of some sort and 
> somehow managing to stay alive in the process.  I would tend to say 
> that if we're going to play game where this is not only a problem 
> that's been solved but is made a trivial element that we can abstract 
> into a given, it's a little silly to say that we won't also have 
> developed a way to build spy satellites that doesn't force us to still

> use giant physical glass lenses in the telescopes.
>
> E
>
> ----- Original Message ----- From: <sipior@sipior.net>
> To: <gzg-l@lists.csua.berkeley.edu>
> Sent: Friday, March 10, 2006 1:59 PM
> Subject: Re: [GZG] Satellite imagery
>
>
>>> So, if your target is at a fixed longitude, very low latitude, and 
>>> your
>>> optics are excellent, then geosynchronous orbits make sense for this

>>> role.
>>>
>>> For Earth's orbit at the extreme end of the visible spectrum (400 
>>> nm) you
>>> would need a ~8.75 m diffraction limited telescope to get 2 m 
>>> resolution
>>> (which is pretty poor.)
>>>
>>> Maybe there is some way to PSB all these considerations (and any
I've
>>> missed) away.  I just don't see them ;-)
>>>
>>> Cheers, Tony C.
>>
>> Gravitic lenses for light focusing. I think that was the PSB 
>> Traveller used
>> to explain how a ship-mounted laser could cut through another ship at

>> five
>> light-seconds without an emitter 100 meters across ;-)
>>
>> Cheers,
>>
>> M.
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