Technical question about Rahu/Ketu Backward motion

[indocanadian]

Hello,

 

I am new to astrology. I have read about Rahu and ketu moving in opposite direction to other planets.

 

Does this have implications in the counting of houses from Rahu(or Ketu) to another planet in another house.

 

example : if rahu is in house 5 and shani in house 1, then for Rahu dasha/shani bhukti aka rahu/shani period , the realationship between rahu and shani is 9? or is it 5 because rahu moves backwards?

 

Please let me know if this sounds confusing. I would appreciate any insight.

 

Thank you.