**WHY 365.25 DAYS - AND NOT 360?**

The question is certainly worth investigating: since the Sun appears to move by near-exactly 1° per day (against the stars), why doesn’t our calendar year last for 360 days? In astronomy textbooks you will find many attempts at explaining why this is the case – but there seems to be no firm, general consensus about this thorny matter. To be precise, each day the Sun is observed to move eastwards vis-à-vis the stars by 3.93 min of RA (1° being equal to 4 min of RA).

Once more, the TYCHOS model ‘comes to the rescue’ - let me illustrate how, in a few easy steps.

The below graphic from Chapter 12 of my book shows why the solar day is 4 minutes longer than the sidereal day. Quite simply, as Earth rotates once around its axis (and slowly moves around its PVP orbit), the Sun will have moved, in the meantime, a bit eastwards (between day 1 and day2). We will thus return facing a given star “X” in 1436 minutes – yet another 4 minutes will be needed for our meridian (which determines the Sun’s zenith) to return facing the Sun.

Hence:

Sidereal DAY = 1436 min (Earth having rotated by 360°)

Solar DAY = 1440 min (Earth having rotated by 361°)

Further on in Chapter 12, I then show why the solar YEAR – on the other hand – is shorter than the sidereal YEAR. This is because our earthly observer “Joe”, having moved by 14036km (in one year) along its PVP orbit, will return facing the Sun about 20.4 minutes before he returns facing the star he faced the previous year. Hence:

Solar YEAR ≈ 365.24219 days - or 525948.753 min

Sidereal YEAR ≈ 365.256363 days - or 525969.163 min

(i.e. a difference of ≈ 20.4 min)

Before we get on, it is important to remind the reader that, in one sidereal year, the Earth actually spins around its axis 36**6**.256363 times. This, because as the Sun circles around us each year (‘counter-clockwise’), it will “subtract” one (‘counter-clockwise’) rotation of the Earth’s axis.

Now, we just saw that one sidereal DAY lasts for 1436 min. We also saw that 20.4 min is the extra time needed for our “Joe” to return facing the same star – following the completion of one solar YEAR. This is what is empirically observed and is thus beyond dispute.

This convenient percentage calculator tells us that 20.4 min is approximately **1.42%** of 1436 min (representing a 360° rotation of Earth’s axis)

Well, **1.42%** of 366.256363 days is just about **5.2** days. And in fact, 20.4 min / 3.93min (the amount that the Sun moves against the stars each day) ≈ **5.2**. This is why a solar / calendar year doesn’t last for 360 days (as in 360°) but more like 36**5.2**(…) days.

*In other words, what causes these 5.2 ‘extra days’ is simply the Earth’s motion around its PVP orbit, thus requiring the Sun-Earth rotational relationship an extra 1.42% to remain synchronized over a full sidereal year, during which the Earth moves ‘westwards’ by 14036km – as stipulated by the TYCHOS model.*

But let’s see if we can find further corroboration in support of the above statement. Let’s imagine for a moment that Earth does NOT move around its PVP orbit – but remains immobile in the middle of the Sun’s orbit. The Sun, however, still employs 25344 years (as of the TYCHOS calculations) to complete a “Great Year” – while Earth’s axis only “ticks” by 20.4 min annually.

In 25344 years, the Earth’s axis would therefore “tick” for a total of : 20.4 min x 25344 = 517017.6 min

As we divide this value by 1436 min (as we should, since a sidereal day only involves a 360° rotation of Earth’s axis), we obtain:

517017.6 min / 1436 min = **360.04011142** (or practically 360!) “axial rotations”

To be sure, this result would not have been obtained if the “Great Year” lasted for any other period than 25344 years – i.e. the duration of the “Great Year” (and of a 360° “equinoctial precession”) as proposed by the TYCHOS model. Likewise, none of the above maths would ‘check out’ with the observed reality if the Earth moved at any other speed or annual distance (respectively 1.6km/h and 14036km) - or any different relative Earth-Sun velocities - than those propounded in the TYCHOS.

Q.E.D.