Abstract:Accurate time information is needed to calculate the star's apparent position, and the influence of the time error on the star's apparent position is relatively small. Accurate time information is needed to calculate the star's apparent position, and the influence of the time error on the star's apparent position is relatively small. Taking into account the need to compute the position of various fixed stars, here are studied on time error correction, self correction, precession, nutation correction, parallax and aberration correction model, through the comprehensive analysis of the impact of time error as the latitude and longitude of the calculated position of stars, influence on the time error by experimental data the demonstration, data analysis shows that when the time error is less than 10 minutes, the apparent position calculation error is less than stellar longitude, latitude 10-4" magnitude and the calculation error is less than 10-4", in does not affect the calculation accuracy of the case, will greatly reduce the time for accuracy.