The International Space Station is the third brightest object in the sky, after the moon and the sun. Hence it is actually visible to the bare eyes and can easily be spotted without any equipment if you know when to look up and what to look for.
There are two upcoming opportunities to watch the International Space Station pass overhead from Adelaide. Sightings are possible on the 17th and 18th of April 2017.
On the 17th, sighting will begin at 6.19am. The International Space Station will be visible for two minutes before crossing back below the horizon. It will appear at 11 degrees south by southwest and disappear at 21 degrees south.
On the 18th, sighting will begin at 5.27am. The International Space Station will be visible for three minutes before crossing back below the horizon. It will appear at 10 degrees south and disappear at 13 degrees southeast.
The International Space Station looks like a fast-moving airplane across the sky. However it does not have flashing lights and it does not change directions. It also flies considerably faster at about 28,000 km per hour (circling the earth every 90 minutes!).
If you are interested, do look out for latest updates on the NASA website. You can also sign up for email and text alerts as to when the International Space Station will be flying over your location.