In fact A is a subject which make an analysis throuth a lot of data and statistics of climate, hydrology , climate change and planet when you were born
A is a subject that it is bases on the climate、hydrology、seasonal variation as well as planets' orbits changes when you were born in, which is analyzed by a large cache of data and statisticses.
Ain fact, according to the climate, hydrology, and seasonal changes in your birth, and the operation of the planet, through a large number of data and statistics to analyze the subject."