text: From above person.\n\nT = 2*pi*(sqr rt. of L/g)\n\nso apply it twice and get two equations with two unknowns. The unknowns being L and g. Assuming that g is 9.80 at the equator.\n\nAt the equator:\n\n0.600 = 2 * pi * (sqrt (L/9.80))\n\nYou can actually just solve that for L.\n\nAt the other location\n\n0.598 = 2 * pi * (sqrt (L/g)) using the L from above.