Hi everybody, thank for helping with previous problem. I have another quesion: This is not an actual problem. While the problem is actually solved in the book one of the steps there is not entierly clear as a result I cannot understand simmilar problem. So here it is 1. The problem statement, all variables and given/known data IF the earth orbit is divided in to by it's minor axis, how much does it spent in one half than another. 2. Relevant equations Here is how is is solved in text. Eccentricity of earth orbit is 0.0167. It is clear that area of swept are is 1/2 area of elipse plus/minus the area of triangle with base 2*b and height ae. so A=1/2*Pi*a*b plus/minus a*e*b. Thus the time tame n are (1/2 plus/minus e/Pi) Years. Thats what I have difficult understanding. How did they make a jump from area to years. Apparently the second evauation was obtined by dividing A over area of elipse a*b*Pi. If this is the case, how did author extracted years?