One of their biggest succections were their math and sciecne. They had used science of the astrological cycle to determine the sun's position. They had used math to predict how long the sun will take to go over us for how long it willl take for the Earth to do one whole rotation.
Their math system wasn't that good and it had not used numbers at the time, but it had used symbols for numbers, such as the number one was a orlce with a line through it. The numbers 2-4 were just dots increasing as the number increases. Number 5 starts out with a line and the dots increase like normal.
They had lasted about 2000 years and they flourished early one which had improved their studying and their skills. They had also dedicated their lives to studying the sky because they were also known for being the masters of the sky.