About Rotational Period and Day Length

Rotational period is the time it takes for an object to complete one full rotation around its axis.

Day length is the duration of one full rotation relative to the Sun (solar day) or distant stars (sidereal day).

• Earth’s solar day ≈ 86400 seconds (24 hours)
• Mars’ day ≈ 88775 seconds
• Jupiter rotates in just under 10 hours

This converter allows quick bidirectional conversions between these units for astronomy, planetary science, or educational use.