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function jDays = JulianDay(utcTime) |
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% jDays = JulianDay(utcTime); |
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% |
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% input: utcTime [mx6] matrix [year,month,day,hours,minutes,seconds] |
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% |
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% output: totalDays in Julian Days [mx1] vector (real number of days) |
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% |
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% Valid input range: 1900 < year < 2100 |
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%Algorithm from Meeus, (1991) Astronomical Algorithms, |
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%see http://www.geoastro.de/elevaz/basics/meeus.htm for online summary |
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% valid range 1900/3/1 to 2100/2/28 |
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% but we limit inputs to 1901 through 2099, because it's simpler |
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%Author: Frank van Diggelen |
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%Open Source code for processing Android GNSS Measurements |
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% check inputs |
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if size(utcTime,2)~=6 |
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error('utcTime must have 6 columns') |
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end |
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y = utcTime(:,1); |
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m = utcTime(:,2); |
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d = utcTime(:,3); |
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h = utcTime(:,4) + utcTime(:,5)/60 + utcTime(:,6)/3600; |
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%check that date is in valid range |
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if ( any(y<1901) || any (y>2099) ) |
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error('utcTime(:,1) not in allowed range: 1900 < year < 2100') |
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end |
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i2 = m<=2; %index into months <=2 |
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m(i2) = m(i2)+12; |
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y(i2) = y(i2)-1; |
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jDays = floor(365.25*y) + floor(30.6001*(m+1)) - 15 + 1720996.5 + d + h/24; |
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end %end of function JulianDay |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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% Copyright 2016 Google Inc. |
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% |
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% Licensed under the Apache License, Version 2.0 (the "License"); |
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% you may not use this file except in compliance with the License. |
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% You may obtain a copy of the License at |
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% |
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% http://www.apache.org/licenses/LICENSE-2.0 |
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% |
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% Unless required by applicable law or agreed to in writing, software |
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% distributed under the License is distributed on an "AS IS" BASIS, |
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% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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% See the License for the specific language governing permissions and |
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% limitations under the License. |
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