Answer:
(a) To find the lengths of the major and minor axes of the Earth's orbit, we need to know the values of "a" and "c". However, this information is not provided in the given text. Without these values, we cannot calculate the lengths of the major and minor axes.
(b) Similarly, since the lengths of the major and minor axes are not given, we cannot calculate the total area enclosed by the Earth's elliptical orbit.