Question: why does a year consists of 365 days and a day of 24 hours?

Kamal Bhattacharya answered on 17 Jan 2017:

Very good question. It is somewhat arbitrary, but imagine you have no sense of formal time measurements as you have today. All you know is day and night. Now you want to know how long it will take to get from one place to another. It’s easier when you have some way to express this, given that you already have numbers. So in the ancient days, people used the wandering shadow of the sun hitting, say, a stick in the sand to divide the day. Initially they used 10 segments a day, but were smart enough to say that you don’t see a shadow at dusk or dawn so add another two segments. Add another twelve units by measuring the movement of the stars (or moon) and there you go: 24h and now you call it a day. Over time you realize that either the sun is moving around the earth or vice versa. How long does it take? 365 days. In the Roman days Julius Cesar mandated his version of calendar as the civil calendar, meaning it was used for business and in society at large. That changed a bit in 15-something into the Gregorian calendar, which is used by almost every country in the word except Ethiopia 🙂 (and a few others).
I think the reason why an hour has sixty minutes is because the ancient people defining that liked the number sixty for some reason, probably a religious one.
So you see, its all logical only to some extent.