After a certain amount of time the sun will discolour your wooden floor, some floor finishes such as lacquers and oils which contain UV blockers can slow down this process, but you will still find that it will change colour over a certain amount of time.
To reduce the amount of fading on your wooden floor it would be advisable to move the furniture around your room frequently, you could also try drawing your curtains in summer at the sunniest time of day to reduce the amount of discolouration of your floor.
The photo below is where a rug had been placed on the wooden floor and had stopped the sun from bleaching out the colour.
If you would like some help and advice on your wooden floor then why not call our team of wood floor specialists on 01223 863638.