I ask because time is defined with reference to this day (the SI second is based on a caesium clock is calibrated with reference to the 1952 ephemeris time standard, which was based on a second being 1/86 400th of Jan 0, 1900 (with Jan 0 being Dec 31 of 1899).
So... how do I calculate the...
Thanks scottdave and jbriggs - I think I found it. The day was the beginning of 1900 (technically Dec 31, 1899) - although the calculations were made in 1952. https://en.wikipedia.org/wiki/Ephemeris_time.
Now I just want to know what was the rotational velocity of Earth on that day :)
The SI definition of a second was originally based on 1/86 400 of a day - but the Earth's rotation is a) unsteady and b) changing so it was changed to a defined number of cycles of an atomic clock. Was there a specific day for which the atomic clock was calibrated? Put another way, why were 9...
Thank you! That gives me a big head-start on learning more about our solar system's motion. I'm guessing from your answer that the Earth's orbit around the sun is therefore very very slightly more or less than 360°, due to its incline to the plane of the Sun's orbit around the MW. Compared to...
One day consists of slightly more than 360° of rotation (360.9856°) on it's axis (due to Earth's orbit around the Sun).
I imagine that one orbit is also either > or < 360° around the sun, relative to the motion of the sun around some object. Is this true, or is the orbit of the Earth...