If Ptolemy’s peripheral map of the ‘inhabited world’ is seen through, and if, it is compared with Alberuni’s statement on longitudinal measurement of the ‘inhabited world’, then it tallies well with what the latter says on the geographical situation of Jambudvipa, same as the ‘first-land’ of the human civilization. Longitude of the ‘inhabitable world’ is determined by the longitude of Lanka(not Simhala), as it sits at the centre of the equator; while Yamakoti(Jerusalem) lies on its east, Romaka(Rome) on its west, and Siddhapura(Greece) on the equator is diametrically opposite to Lanka.

Yamakoti and Rum are distant from each other by half a circle. Astronomers  assign the countries of the ‘west’ to Rum or the Roman Empire, because the Rum occupy the opposite shores of the same sea ; for the Roman Empire has much northern latitude and penetrates high into the north.

Alberuni though differs from the latitude calculation of ancient Indian astronomers, it is not that correct. That the longitude of the ‘inhabitable world’ is a half circle is an accepted theory among ancient astronomers; they differ only as to the point which is to be its beginning. Their beginning of longitude is Ujjain, which Indian considers as the eastern limit of one quarter, whilst limit of the second quarter lies in the west, at some distance from the end of civilisation.

Here the visible problem is that the translator of Alberuni’s ‘India’ thought of the present political India which is not the case; similarly, when he thought of Romak as ancient Rome, he took present Rome as seat of the ancient Roman Empire.

The whole problem again arises out of the fact that present Ujjain in Madhya Pradesh does not represent the ancient Ujjain. Its name as ‘Madhya Pradesh’ does not validates its geographical position at the centre of the earth. It is a colonial designation of this state.