Different points in the Earth are at slightly different distances from the Sun and hence experience different forces due to gravitation. For a rigid body, we know that if various forces act at various points in it, the resultant motion is as if a net force acts on the CM (center of mass) causing translation and a net torque at the CM causing rotation around an axis through the C. M. for the Earth-Sun system (approximating the Earth as a uniform density sphere):
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As the Earth is revolving around the Sun in a circular motion due to gravitational attraction.
The force of attraction will be of radial nature i.e., angle between position vector r and force F is zero. So, torque 
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