The only thing that means is that it is recommended that the sun does not enter directly thru the window.

See what happens if the window is pointing north (on the northern hemisphere). From autumn to spring the sun will be on the south side of your house, so will not hit the north window.

In summer (northern hemisphere) if you live below the tropic the sun could hit your north window.

If you live in the equator that means that you could use a north window from autumn to spring.

But that is a little dumb if you do not have a rotating house n_n.

To specifically answering the question, you could invert the concepts. The southern hemisphere, south window, and seasons.

But I would forget about the geographical conditions. We need need to understand the nature of light.

Some variables I can think of is what is happening outside that window.

• The hour of the day
• Is it sunny or not
• Do you have another building or wall in front of the window
• What color is that what is on the outside
• What kind of glass I have in the window
• What curtains I have.

The main point is that on that particular case you want a defused light. Period.

But dam! if the light is great at 9 am and enters wonderfully into your beautiful window on a great still life theme, use it!

A specific case is for portrait photography. Direct sunlight on a face can be difficult to handle, but you can always use as a highlight instead of the main light. So you also can use direct sunlight in an interior on a portrait too.

There is a big chance you need to bounce some light or use a fill flash to reduce the contrast.

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If your windows are pointing to:

East That means you try to shoot after 12:00 hrs.

West Before 12:00 hrs.

And whatever combination of shade/orientation of the windows.