# Tessear E13: Exogenous Year? Leap Year? Sidereal Year?

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The discovery by @InvestigateXM and @MegaSteeliX reveals a lot about the truth of Tessera and the truth of time: 28 days makes a month, and 13 months makes a year. In that setting, we have 364 days in a year, which is quite close to our current calendar. (BTW @MegaSteeliX has a thought-provoking discussion on the history of implementing 13-month calendar in human histroy.)

Their excellent works make me thinking about an important next-step question: what is a year? and why?

When people (especially people who haven't witnessed the miracle of the 13 Magnus, the Shaper and the N`zeer) talks about year, most of time they are referring to so-called “year” made of 365.2422 days. This is why we have 365 days in an ordinary year, and 366 days in a leap year (every 4, but not every 100, but every 400 years). This is only true when we use tropical year. A tropical year (also known as a solar year) is the time that the Sun takes to return to the same position in the cycle of seasons, as seen from the Earth.

However, there is anothe definition of year, which is more commonly-used among astrophysicists: sidereal year. A sidereal year is the time taken by the Earth to orbit the Sun once with respect to the fixed stars. One sidereal year consists of 365.2564 days, which is 20 min 24 sec more than one solar year.

I notice that, for every 39 (=3*13) years (sidereal year, henthforth) there is 49 extra days. This is to say, on top of 364 days, every year we have an extra day, every three years we have another extra day, and every 13 year we have one day less.

In another word under the Exogenous Calendar, for every 39 years, there is 26 ordinary year (365 days), 10 leap year (366 days), and 3 unusual year (365 days). For every 3 years there is a leap year, and for every 13 years there is an unusual year.

These above gives the simpliest calendar system considering the Tessera E13.

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The following is my guess:

(1) For the ordinary year, the extra day falling to a given month (13 Exogenous month, henthforth), the corresponding Magnus gets stronger. Its ability and the impacts on human beings are amplified.

(2) For the leap year, the two extra days falling to one or two months. If they fall to one single month, the corresponding Magnus gets much stronger. If they fall to two different months, two Magnus get stronger simutaenously and more influences remain to be seen.

(3) For the unusual year, instead of one extra day, there is actually two extra days and one missing days. If one of the extra days gets together with the missing day, the aggregate effect is identical to case (1). However, if two extra days but not the missing day fall together, or all of the 3 days go different months, the aggregate impacts of Magnus can get really complicated, and that's when a lot of anomaly events are observed.

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Last but not least: why sidereal year but not the solar year? A solar year is straghtfoward to the observer if the observer is on the Earth (i.e., mankind), that explains why we choose solar year in our current calendar system. However, a sidereal year is straightforward to the observer if they are on a far, fixed location. The Tessera seem to work with a sidereal year. Does it mean the observer is not us, but someone far from us?

WHO ARE THEY??? WHERE ARE THEY???

Be careful, NIA and truthseekers!

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