Why is there a fixed ammount of time that the Earth orbits in a month?

Question: Why is there a fixed ammount of time that the Earth orbits in a month?
- Keywords:
  earth,
  gravity,
  solar
Asked by Sophpix to Helen on 21 Nov 2014.
- Helen Johnson answered on 21 Nov 2014:
  
  Sorry I’m not sure what you mean, do you mean a fixed distance it travels in a month? That’s because the Earth is orbiting the Sun with a roughly constant speed.

Sophpix commented on 21 Nov 2014:

Thank you, that is what I meant!

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Question: Why is there a fixed ammount of time that the Earth orbits in a month?