The egyptians developed an accurate 365 day calendar by basing their year on

Solar light.

Explanation:

The ancient Egyptians used a lunar calendar exclusively until they adopted their solar calendar. The lunar calendar was then used for their religious festivals and rituals, but for their daily lives, the ancient Egyptians used a solar calendar that contained 365 days per year.

kennedy used a range of this to develop a 'flexible response' plan for any international crisis. “he also expanded the it was important, because it ordered the fall of khruschev.

i believe it was the shinto