The perception that days and years are getting faster or slower is primarily subjective and can vary from person to person. It is important to note that the actual duration of days and years remains constant.
However, there are several factors that can influence our perception of time. One factor is our level of engagement and the amount of novelty and stimulation in our lives. When we are busy and actively engaged in various activities, time can seem to pass quickly. Conversely, when we are bored or experiencing a lack of stimulation, time may appear to pass more slowly.
Furthermore, our perception of time can be influenced by age. As we grow older, a year becomes a smaller fraction of our total lifespan, which can contribute to the feeling that time is passing more quickly.
It's worth mentioning that Earth's rotation and its orbital motion around the Sun remain relatively constant. However, minute variations in these movements can occur due to various factors, such as gravitational interactions with other celestial bodies or the distribution of mass on Earth. These variations are known as perturbations and can cause slight deviations in the length of a day or a year. Scientists carefully measure and account for these variations to maintain accurate timekeeping.
In terms of historical evidence, the measurement of time has significantly improved over the centuries. Ancient civilizations used various methods to track time, including sundials and water clocks, which were less precise than modern methods. As our measurement techniques have become more accurate, we can detect and account for very subtle changes in the length of days and years. However, the changes observed over long periods of time are relatively small and are not usually noticeable in our day-to-day lives.
Overall, while our perception of time can vary, the actual duration of days and years remains constant, with only slight variations that are carefully monitored and accounted for by scientists.