Convert Picosecond (ps) to Day (Sidereal) (d (sidereal)) instantly.
About these units
Picosecond (ps)
A picosecond equals 10⁻¹² seconds. At this timescale, even light travels only about 0.3 millimeters, making picoseconds vital in advanced optics, ultrafast laser systems, and femtochemistry. Picosecond lasers enable precision cutting in medical devices, microfabrication, and semiconductor processing. They also allow scientists to study vibrational modes of molecules and rapid electron transitions in materials. In telecommunications, picosecond precision is necessary for characterizing optical fiber dispersion, jitter, and photonic switching. At such rapid intervals, the boundaries of classical physics begin to blur, leading toward quantum mechanical interpretations of time and energy.
Day (Sidereal) (d (sidereal))
A sidereal day is the time Earth takes to rotate exactly 360 degrees relative to the distant stars—about 23 hours, 56 minutes, 4 seconds. In contrast, the solar day is slightly longer because Earth advances in its orbit each day and must rotate extra degrees for the Sun to appear in the same position in the sky. Sidereal days are fundamental to astronomy: telescopes use sidereal time to track stars, which appear in the same position in the sky at the same sidereal moment each night. This unit anchors astronomical observation to the cosmos rather than to the Sun.