Who developed a calendar of 365 days and start the day at midnight?

Question

Who developed a calendar of 365 days and start the day at midnight?

Answer 1

It is natural record of how things are. It is 365 days and 6 hours every year. On the calender every shows 365 days and every 4 years they add 1 day.  

Answer 2

Because the earth is tilted with respect to the sun the days grow longer then shorter away from the equator as the year passes and the seasons change.  Many ancient civilizations could fairly easily observe that it takes almost 365 full days for conditions to go full circle.  Humans sleep at night and it is easy to imagine that a 'day' would include all the useful daylight hours (and not start perhaps at midday).  The day could start of course at sunrise but when clocks divided the day into 24 hours it likely was easier to separate days at midnight and daylight hours at AM vs PM (ante and post meridian or before and after high noon).  Like the wheel it is perhaps difficult to determine now based on available records who got it right first (Stonehenge?).  

Answer 3

there are 360 degrees in a circle. the days in a year varies between less than 360 and more than 360 between very long periods of time. the average of these numbers is 360.