Depends what you mean by instrument but I guess the sun, mmon and stars are pretty good indicators to use.
the presence of day and night proved its rotation
Yea they do its a simple answer they are so hi the mass of a huge clump of them will slow down earths rotation
rotation
Gyres
None (that we know of).
A yawmeter is an instrument which measures the yaw of an aircraft, its degree of rotation about its vertical axis.
A tachometer is an instrument that measures the rotation speed of a shaft or disk, as in a motor or other machine.
A tach (short for tachometer) is an instrument that measures the rotation speed of a shaft or disk, as in a motor or other machine.
What is the earths rotation about
What is the earths rotation about
rotation
the Earths rotation
24 hours rotation
the presence of day and night proved its rotation
That's "rotation".
Yea they do its a simple answer they are so hi the mass of a huge clump of them will slow down earths rotation
earths rotation