1. The mean solar day is the average length of a day over the course of a year.
2. The mean solar day is used as the standard unit of time for most purposes.
3. One mean solar day is equivalent to 24 hours.
4. The mean solar day is slightly longer than the actual solar day due to the Earth's elliptical orbit.
5. The mean solar day is calculated by dividing the total number of solar hours in a year by 365.25.
6. Greenwich Mean Time is based on the mean solar day at the Royal Observatory in Greenwich, England.
7. The length of a mean solar day can vary slightly depending on the Earth's rotation speed.
8. The mean solar day is used in astronomy to calculate the position of celestial bodies.
9. The mean solar day is a fundamental unit of time measurement in scientific research.
10. The concept of the mean solar day has been used for centuries to track the passage of time.