Two observers, one in northern canada and the other in australia, are looking at the moon on the same day. the observer in canada sees a third quarter moon. what does the observer in australia see?

In general, because of the synchrony that exists between the translation and the rotation of the moon, we will always see the same face of the moon. From there it is also contingent that everyone on the whole earth see the same moon phase the same day. However, it should be noted that the northern and southern hemispheres see the moon oriented differently from the horizon. This also added to the time zone that shows a small and tiny difference in the way the moon is projected. In general terms someone in Australia and Canada will see the same phase - but probably with the light positioned in an inverted way-