The notion that north should always be up and east at the right was established by the Greek astronomer Ptolemy.

The scientist of the Roman period who had the greatest influence on later generations was undoubtedly the astronomer Ptolemy.

The ancient astronomer Ptolemy included Ursa Minor in his list of 48 constellations.

The astronomer Ptolemy listed it when he made a list of 48 constellations in the 2nd century.

The Greek astronomer Ptolemy previously identified many towns in the district of Bagalkote.

The astronomer Ptolemy listed Aquarius when he made a list of 48 constellations.

This method was used by the ancient astronomer Ptolemy, who derived them in the Almagest, a treatise on astronomy.

The astronomer Ptolemy developed the concept of standardized time measurement using which method?

The astronomer Ptolemy counted it as part of the constellation Centaurus.

The astronomer Ptolemy listed Auriga in the 2nd century when he was writing a list of 48 constellations.