# Natural Time Units

I ditched all the clocks in my home today. I felt that the time
measurement we usually use is too artificial. I want to use natural
units like Planck units for everyday life. Who cares about a second?
But unfortunately Planck units are too impractical for everyday
use.

By trying to find natural time units, although I know that it's
too obvious, I realized that sun & moon literally work like the
metric tensor for the earth. Imagine the sun & moon being O(1,3)
itself...

Hence ironically I will introduce traditional time units on this
post. However, in their original (traditional) forms. Not the forms
in the modern science. So let's start.




## Base

The base units are only Day, Year, and Month. Other units are all
derivatives.

### Sun

I think I don't need to explain these at all. But to be traditional
and suitable for everyday use, you should think geocentrically.

* Day
* Year

### Moon

* Month = (1 lunation) ~ 29.5 days ~ (1 zodiac sign)

Lunation means lunar cycle. Note that "Mon" in Month means moon.



## Derivatives

I don't know if I could call this a derivative, but


* Menstrual cycle ~ (1 lunation)

Since (the average) ~ 28.5 days. This would be the biggest reason
of why the moon is feminine. But the standard deviation is quite
large.

As above, so below.



* Week = (a quarter of lunation)

So

(New moon)
-(Waxing half)
-(Full moon)
-(Waning half)
-(New moon)

is (4 weeks) = (1 month). Since (1 week) ~ (7 days) and there are
exactly 7 classical planets (Sun, Moon, Mars, Mercury, Jupiter,
Venus, Saturn), each day of a week represents each classical planet.


* Hour

(Day hour) = (1/12 of sunrise-sunset)
(Night hour) = (1/12 of sunset-sunrise)
(Day) = (12 day hours) + (12 night hours)

The use of 12 is because of (Year) / (Lunation) ~ 12. It's quite
arbitrary.

Each hour represents a classical planet. Similar to a week, but
this includes duplications.

For more information, check [Cidoku's post][0].




## Intercalary months

To sync solar and lunar calendar, you need the intercalary months.
For every 32.5 months you need 1 more month.

In ancient Athenian calendar, they added a month on
3, 6, 8, 11, 14, 17, 19
-th year of every 19 years cycle.

In Hindu calendar, it's
3, 5, 8, 11, 14, 16, 19
-th year.

If you want to know other cases, search yourself. I can't list
everything.




[0]: https://cidoku.net/notes/planetary_hours