According to the theory of relativity, time dilation occurs when an object is in motion relative to another object. This means that the passage of time can appear to be different for observers in different relative states of motion. The effects of time dilation become more pronounced as velocities approach the speed of light, but they are still present even at lower speeds.
On Earth, we are indeed moving at high speeds due to the rotation of the Earth on its axis and its revolution around the Sun. However, the velocities involved are significantly lower compared to the speed of light. As a result, the time dilation effects experienced by humans due to these motions are extremely small and practically negligible.
To put things into perspective, the time dilation caused by the Earth's rotation results in a minuscule time difference compared to an observer at rest. Similarly, the time dilation due to the Earth's revolution around the Sun is also extremely small. These effects are so tiny that they are far beyond the capabilities of our current technology to measure.
However, even though the time dilation effects due to Earth's motion are negligible for human observers, they are still taken into account in high-precision experiments and measurements. Modern technologies, such as GPS systems, do consider the effects of general relativity to ensure accurate positioning and timing.
It's important to note that the theory of relativity predicts significant time dilation effects in situations where velocities approach the speed of light or in the presence of strong gravitational fields. These effects have been experimentally confirmed and have practical applications in various fields of physics, including space exploration and satellite-based systems. But in our day-to-day lives on Earth, the time dilation effects caused by the planet's motion are not noticeable.