The purpose of calculating super accurate ephemerides using NASA's method is to accurately predict the positions of celestial bodies in the sky at a given time. This is important for various scientific and practical applications, such as space exploration, navigation, and astronomical research.
NASA uses a complex mathematical model called the Jet Propulsion Laboratory Development Ephemeris (JPL DE) to calculate super accurate ephemerides. This model takes into account the gravitational interactions between celestial bodies, as well as other factors such as the rotation and shape of planets, to predict their positions with high precision.
NASA's ephemerides are considered to be highly accurate, with an average error of less than 1 kilometer for the positions of planets and less than 10 kilometers for the positions of other celestial bodies. This level of accuracy is crucial for space missions and other scientific endeavors.
Yes, NASA's ephemerides can be used for predicting the positions of celestial bodies for thousands of years in the past or future. However, the accuracy may decrease for very long time spans due to the complex and unpredictable nature of celestial bodies.
While NASA's method is highly accurate, it does have some limitations. For example, it does not take into account certain factors such as the influence of smaller celestial bodies or the effects of general relativity. Additionally, the accuracy may be affected by unforeseen events such as collisions or changes in the orbit of a celestial body.