Seleucus of Seleucia

Seleucus of Seleucia was a great ancient Greek mathematician and astronomer. He solved many astronomical problems of his time, mainly the earth’s rotation around its axis and around the sun (heliocentric system or model).

Seleucus of  Seleucia is the first who discovered the relationship between the phenomenon of tides and the movement of the moon. More specifically, he observed the tides in the Red Sea for a long time and he revealed their relationship with the different positions of the moon in the zodiac cycle.

Also he explained the phenomenon of the annual flood as the reason for the resistance of the moon to the next rotation of the atmosphere. This certainly does not seem to happen, but at least he was the first to distinguish the inequality in the rotational speed of the earth’s atmosphere.

Sadly, none of his writings were preserved.

Mary Roboti, Grade 2, 2nd Junior High School of Paralia.


Menaechmus was an important geometer of Ancient Greece in the 4th century BC. He was the teacher of Alexander the Great in Mathematics. He was considered the first who discovered and singled out the three types of conic sections:



parabola, and


He also dealt with doubling the cube, known as the Delian problem.

Apart from these he dealt with astronomy.

Mary Roboti, Grade 2, 2nd Junior High School of Paralia