A Proposal for Earth Decimal Time 




Version 
1.4 
Last Modified
at 
0.244379 
Earth Decimal
Time (EaDT) 

Copyright �
2007, Richard L. Mitchell 


Mean Solar Year = 
365.2421934 

Much like
current time except no dividing by 12.�
Also years exactly track the Sun and months exactly track the Moon. 

Start of
2007 =� 
39162.005 


Current
Method of Time Measurement 

Decimal Time 
Nickname 

Decimal to Current 

Year 
Starts January 1 

Year 

Starts at vernal equinox, divisions
are determined by mean solar year 

Same as solar year 

Deciyear 

One tenth of a year based on mean
solar year 

1.2 
months 
Month 
Starts January 1, variable number of
days 
Month 

Starts at first new Moon closest to
the vernal equinox 

Same as lunar month 

Centiyear 

One hundreth of a year 

3.652421934 
days 
Day 

Day 

First day of month starts as above,
second day starts one Earth rotation later 

Same 


Milliyear 
Mil 
One thousandth of a year 

8.765812642 
hours 
Hour 
Onetwentyfourth of a day 


Decimilliyear^{1} 
Demil 
One tenthousandth of a year 

0.876581264 
hours 

Centimilliyear^{1} 
Cemil 
One hundredthousandth of a year 

5.259487585 
minutes 
Minute 
One sixtieth of an hour 


Microyear 
Mic 
One millioneth of a year 

31.55692551 
seconds 

Decimicroyear^{1} 
Demic 
One tenmilloneth of a year 

3.155692551 
seconds 
Second 
One sixtieth of a minute 


Centimicroyear^{1} 
Cemic 
One hundredmillionth of a year 

0.315569255 
seconds 


Time would be stated as x.xxxxxx if
down to the microyear. 


Time at the end of the year might
reset before reaching .999999 if the year is shorter than the Mean Solar
Year. 


If the year is longer than the Mean
Solar Year, time would be stated as y+.yyyyyy where y is the next year and
.yyyyyy is 


� the factor over. 


There would still be 12 months in
the year of 29.5 days each. 


The first month of the year could
start up to 14.25 days prior to the vernal equinox and up to 14.25 days
after. 


The day at the end of the month
would normally straddle the month line i.e. be at the end of the previous
month and 


�
at the beginning of the next month. 


Time would be the same all over the
Earth. 


^{1} Combining decimal references is
normally not considered acceptable.� In
fact there is movement for getting rid of Deci and Centi since they are not
10^{3}
references.� I believe we need these
degradations though.� I proposed some
nicknames. 




















