We assume that September 23 is the day of the autumnal equinox, and on the day of the spring equinox the sidereal time at noon is 0 hours. In addition, we take into account that the sidereal clock “runs away” by 4 minutes per day compared to the sun clock. For half a year the sidereal clock has gone 180 * forward 4 = 720 min. = 12 hours.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.