The following picture shows a rogue planet (in purple) approaching Earth (in blue). It is spinning prograde like Earth. We're talking about a close approach. For example a planet the size of the moon approaching within 12,000km of Earth. That would be just outside the roche limit. I presume the interaction would result in a slight change in Earth orbit around the sun, pulling it outwards. This is why I have drawn a new line for Earths orbit after the interaction. This would make the length of a year on Earth longer I presume? Would the interaction also slow down Earths spin? ...resulting in a day becoming longer? For example, resulting in there being maybe 28 hours in a day instead of 24? Any insight would be greatly welcomed.