At 12:09 PM 2/8/01 -0500, you wrote:
>Can anyone point me to more info on how they do star sighting? That seems
>to me to be a fairly difficult problem. It would be especially interesting
>to see how they solved it with 1950s or 60s electronics.

Specialized vidicon type tubes that used magnetic deflection. You diddle
current through the deflection coils to center the image of the star.

With care, bandwidths of 100kHz could be achieved, far beyond what you
can do with ordinary CCD imagers today. Price was high, of course.

Best regards,

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com
Contributions invited->The AVR-gcc FAQ is at: http://www.bluecollarlinux.com
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.