How can it be proven that there are 365.2425 days in a year?

Answer 1

Its already proven. Whats your point?

Answer 2

Watch the Sun. When it comes back to the same place in the sky, as measured against the background of stars, one year has passed. But it is only approximately 365.2425 days. The exact number is a non ending, non repeating decimal that starts with 365.2425... Astrologers have been watching and measuring this movement since long before modern astronomy was invented. The Sun moves from Aries to Taurus to Gemini, all the way through all the Zodiac constellations and back to Aries in a little more than 365 days.

Answer 3

First, let’s determine how many days are in the typical 4 year period:
365 days × 4 + 1 leap day = 1,461 days

Now let’s determine how many days there actually are in a 400 year time span. Since we already have a rough calculation for 4 years, we can multiply that by 100 and then account for the 3 times the 3 leap days that wouldn’t occur because even though the year would be divisible by 4 and 100 it wouldn’t be divisible by 400:
1,461 days × 100 - 3 leap days = 146,097 days

Now let’s simply divide the number of days in a 400 year time span by 400 to get the average amount of days in a year:
146,097 ÷ 400 = 365.2425

Answer 4

Make a record of how long it is from one spring equinox to the next. Keep making this record for many years -- at least 20, better is 200, better yet is 600 years or so. You will need to set up a priesthood to do this. Try to record the length of the years to the nearest minute at least -- nearest second is better.

The year length measured this way will vary from year to year. Take an average, it will be 365.2425 days, more or less.

Answer 5

Measure the time between a well established point in our orbit, for example an equinox.

There are multiple methods to do this. The most low tech is to simply keep track of when the sun rises and sets. Measure the time between sunrise on an equinox and sunrise on the same subsequent equinox and you will find that it is equal to 365.2425 days.

Answer 6

Count the days in an year

Answer 7

Mathematically.

Answer 8

You just did. All I have to do is take ur word for it. 365 days, 6 hrs. 15 min. right?

Answer 9

365.2425 takes into account:
(1) regular leap-years; those evenly divisible by 4
(2) skipped leap-years; those evenly divisible 100
(3) non-skipped leap-years; those evenly divisible by 400 (even though they are evenly divisible by 100, which are normally skipped)

Answer 10

Leap years make it an uneven number.