किस प्राचीन विद्वान ने सबसे पहले वैज्ञानिक रूप से पृथ्वी की परिधि की गणना की थी?

Polar flattening (f) of the Earth ellipsoid is determined using which of the following parameters? (1) Equatorial radius (a) (2) Polar radius (b) (3) Polar axis direction

The concept of 'Geodesy' is primarily concerned with:

The scientific discipline that deals with the measurement and representation of the Earth's geometric shape, orientation in space, and gravity field is known as: