Definition:Sidereal Day/Mean

Definition

The mean sidereal day is the mean of the values the apparent sidereal day takes throughout the course of a year.

Hence the mean sidereal day is:

$23$ hours, $56$ minutes and $4.0916$ seconds

$23.9344699$ hours

$0.99726958$ (solar) days.

Also see

• Definition:Apparent Sidereal Day

• Definition:Day

Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): day
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): day