3 ms·
"Theoretically, you could measure the rotation of the earth and call that a day" This is not theoretical; this is known as sidereal time and is measured to the
by dfc 15y ago
"Theoretically, you could measure the rotation of the earth and call that a day"
This is not theoretical; this is known as sidereal time and is measured to the nanosecond...
http://en.wikipedia.org/wiki/Sidereal_time http://en.wikipedia.org/wiki/Sidereal_time
- mceachen 15y agoExcept that "…due to nutation, an actual sidereal day is not quite so constant." Yeah. Nutation. Nutation "…is a rocking, swaying, or nodding motion in the axis of rotation of a largely axially symmetric object, such as a gyroscope, planet, or bullet in flight…" http://en.wikipedia.org/wiki/Nutation http://en.wikipedia.org/wiki/Nutation