The Science Behind the Length of a Solar Day and How It Affects Timekeeping
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Introduction The length of a solar day refers to the time it takes for the Earth to complete one full rotation on its axis, and it is usually considered to be approximately 24 hours long. However, due to various factors, the length of a solar day can vary slightly from day to day. Factors That Affect the Length of a Solar Day There are several factors that can affect the length of a solar day: Gravitational Pull of the Moon and Sun The moon's gravity creates tides on Earth, which cause a slight bulge in the oceans. This bulge creates a gravitational pull on the moon itself, causing it to slow down slightly in its orbit. As a result, the Earth's rotation is affected, and the length of a solar day can vary by a few milliseconds. Similarly, the sun's gravity can also affect the Earth's rotation and the length of a solar day, but to a much lesser extent than the moon. Earth's Distance from the Sun The Earth's orbit around the sun is not perfectly circular, but rathe...