Even though modern historians and archeologist cannot pinpoint the exact time first sundials were used, remains of Egyptian and Babylonian can provide us with clear proof of their existence. Massive Egyptian sundial obelisks were erected from the North African sand in 3500 BC, which proves that smaller sundials were used even bore that distant age. Historical records from first two millennia BC can even give us picture of Egyptian view of the time. Because they lived in the desert environment with small daytime variations in yearly seasons, they split their daytime into 10 equal hours, with 4 additional hours that were split into hours of sunrise and sunset.