"Roska Gozwild" wrote:

Is it possible to see the International Space Station from
Sydney/Australia with an 250 mm Dobsonian telescope of type as shown in
the following link (http://www.bintel.com.au/BT252.html) ?

Well . . .

You can spot the ISS from Sydney with your naked eye; got to

http://www.heavens-above.com/

to get pass predictions for your location.

Spotting it through a Dob is another matter. You'd need to
know exactly where the station will be in the sky, point the
telescope at the precise location and look just as it zips
across your field of view. If all goes well you *might* get
a glimpse of the station's T-shape.

Forget about tracking the station with a Dob. You
would have to know which way the bird is moving and
wrestle with the telescope to move it, and keep the ISS
in the field of view while not jamming the eyepiece into
your eye. Congratulations if you can manage it.

I've managed to track a few satellites through a 15 cm,
f/8 Newtonian on an equatorial mount, but those birds
were all moving slowly at the apogee of eccentric orbits.
Even then I only saw a moving point of light.

--Bill Thompson