Your Values from Sheet 1: P(days) P(years) 4 0.0109 Enter your P in days P(days)= A= AU From the Star To convert P(days) to P(years), divide by 365 - OR - You can also break the formula in to 3 parts Enter your average P value P(yr) Square P p /2 Cube root P(days)= 0 0 O AU from th P = period in years A = distance in AU P3 = A' P = VA in Excel, P - A^1/3