Find the length of the major axis of earth's orbit using kepler's third law and the fact that earth's orbital period is 365.256 days. use gequals6.6726 times 10 superscript negative 11 baseline nm squared kg superscript negative 2, mequals1.99 times 10 superscript 30 baseline kg, and piequals3.14. recall that 1 nequals1 kg times m times s superscript negative 2.