You are an intelligence officer and have been taken to an unknown location in Australia The intellig...........

Geography Shape and Motions of Earth

You are an intelligence officer and have been taken to an unknown location in Australia. The intelligence team back in India knows your longitude due to the time zone in which you have been

captivated. You need to communicate only your latitude to the officers in India to help them evacuate you. You can know the latitude of your place by

Measuring the angle of the Pole Star from your place

Finding out the rate of rotation of the Moon

Measuring the rate of revolution of earth around the Sun

It is not possible by any of the above.

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Explanation:

Options B and C will remain constant irrespective of the position from where you measure these values. So, you cannot determine your latitude by these values.
Option A would have been helpful if you had been captivated in the Northern hemisphere. Pole star is not visible from Southern hemisphere (Australia), hence it is of no use to you.
None of the given options A, B or C is correct.

In ancient times, people used to determine directions during the night with the help of stars. The North star (Pole star) indicates the north direction. It always remains in the same position in the sky. You should see this link to understand how we can measure it Latitude is basically the angle of your place from the centre of the Earth (equatorial position). You can either find out this angle OR find out the angle of your place with respect to the North Pole. Finding the latter is easier as Pole Star is always found vertically above the North Pole. If you can find your place’s angle from the Pole star (North Pole), just subtract it from 90 degrees to arrive at your place’s latitude.