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Home » Space Flight/Orbital Mechanics » Reduced,Modified,Truncated,Dublin Julian Days, Mars Solar Date

Reduced,Modified,Truncated,Dublin Julian Days, Mars Solar Date

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Julian Day is defined as the number of days since noon UT on January 1, 4713 BC.

clc;
clear all;
% Input Date: April 11,2013.  UT time 20:11:30
year  = 2013;  month = 4; day   = 11;
hour  = 20; min   = 11; sec   = 30;
UT = hour + min/60 + sec/3600;
J0 = 367*year - floor(7/4*(year + floor((month+9)/12))) ...
    + floor(275*month/9) + day + 1721013.5;

JD = J0 + UT/24;              % Julian Day
RJD = JD - 2400000;           % Reduced JD
MJD = JD - 2400000.5;         % Modified JD, Introduced by SAO in 1957
TJD = JD - 2440000.5;         % Truncated JD, Introduced by NASA in 1979
DJD = JD - 2415020;           % Dublin JD, Introduced by the IAU in 1955
MSD = (JD - 2405522)/1.02749; % Mars Solar Date
fprintf('Julian Day   = %6.4f [days] \n',JD)
fprintf('Reduced JD   = %6.4f [days] \n',RJD)
fprintf('Modified JD  = %6.4f [days] \n',MJD)
fprintf('Truncated JD = %6.4f [days] \n',TJD)
fprintf('Dublin JD    = %6.4f [days] \n',DJD)
fprintf('Mars Solar Date = %6.4f \n',MSD)
Julian Day   = 2456394.3413 [days] 
Reduced JD   = 56394.3413 [days] 
Modified JD  = 56393.8413 [days] 
Truncated JD = 16393.8413 [days] 
Dublin JD    = 41374.3413 [days] 
Mars Solar Date = 49511.2763

 

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