Podcast #128: We chat with Kent C Dodds about why he loves React and discuss what life was like in the dark days before Git. Listen now.
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Rotational speeds of planets cannot be calculated/predicted because planet formation seems to be highly chaotic. The spin of planets (both rocky and gas) is determined by many factors, including:

  • the angular momentum of the material which was accreted on the planet,
  • gravitational interactions with other planets,
  • the history of collisions as the planet formed
  • tidal interactions with the host star (if the planet is close in) and the gaseous and debris disks while the planet was forming.