Revolution under the influence of a central force

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SUMMARY

The discussion centers on the effects of Earth's rotation and revolution on the day-night cycle. A participant argues that without Earth's rotation, there would still be a day-night cycle due to its revolution around the Sun, which is incorrect. The consensus among contributors is that without rotation, a point on Earth's surface would not change its position relative to the Sun, resulting in a perpetual day or night for that point. The conversation highlights the importance of understanding the distinction between rotation and revolution in physics.

PREREQUISITES
  • Understanding of diurnal motion and its implications on day-night cycles
  • Familiarity with concepts of rotation and revolution in celestial mechanics
  • Knowledge of reference frames in physics, particularly inertial frames
  • Basic grasp of angular momentum and its relevance to rotational dynamics
NEXT STEPS
  • Research the concept of Sidereal Day and its implications on Earth's rotation
  • Study the Coriolis effect and its mathematical representation in rotational motion
  • Explore the differences between angular momentum and linear momentum in celestial bodies
  • Investigate the role of torque in rotational dynamics and its effects on motion
USEFUL FOR

Physics educators, students studying celestial mechanics, and anyone interested in the dynamics of Earth's motion and its effects on day-night cycles.

  • #31
A.T. said:
Yeah, I got that. Just though that the concept of negative days might be confusing.
You are right. There is a separate formula for retrograde rotation, which gives positive days. But I would rather use one formula with negative numbers than two formulas with positive numbers.
 

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