Time, Calendars, and SeasonsIntroduction |
Does the Earth always rotate and revolve around the sun at the same speed? |
No, the Earth’s revolution around the sun and rotation on its axis are not perfect. Its daily rotation may vary by approximately four to five milliseconds, and is slowing down at a rate of one millisecond each century, due to tidal friction. Additionally, the axis wobbles slightly, and the length of revolution around the sun varies by a few milliseconds.