Planet rotational periods help

[Threeofseven]

I'm trying to decipher the rotational periods of planets. I know a period of 1 day would be 24 hours and 3 days would be three earth days but I see a lot of them with a period of -0.4 days and -4.9 days etc. Any method to calculate the actual rotation period in hours when it's a negative number?

 

[Riverside]

Just rotating the other direction, nothing complex.

 

[Aussiedroid]

I'm just guessing, but could the planet be rotating backwards around the star relative to Earth's rotation?

 

[Threeofseven]

Just rotating the other direction, nothing complex.

Oh, that's what it means?? Seems Iv had it all wrong. Thanks!

 

[Valethar]

Time Lords.

 

[Bryan K]

Venus should have a negative rotation as well. Quite the odd case, as not only does it spin backwards but its "day" is longer than its year.