Convert Julian Date to Greenwich Apparent Sidereal Time

Version 1.2.0.0 (2.68 KB) by Darin Koblick
Find the Greenwich Apparent Sidereal Time Given any Julian Date
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Updated 29 May 2012

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Convert a specified Julian Date Vector to Greenwich Apparent Sidereal Time (GAST). The expected input matrix may contain multiple dimensions. The output matrix will be in the same size as the input matrix. Warning: Use caution when using GAST as a substitute for Greenwich Mean Sidereal Time (GMST).

To run JD2GAST, use the following code sequence:
GAST = JD2GAST(JD);

Where:
JD is the Julian Date input (days)
GAST is the resulting Greenwich Apparent Sidereal Time output (0 to 360deg)

Cite As

Darin Koblick (2024). Convert Julian Date to Greenwich Apparent Sidereal Time (https://www.mathworks.com/matlabcentral/fileexchange/28232-convert-julian-date-to-greenwich-apparent-sidereal-time), MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2007b
Compatible with any release
Platform Compatibility
Windows macOS Linux
Categories
Find more on Dates and Time in Help Center and MATLAB Answers
Acknowledgements

Inspired by: Julian Date to Greenwich Mean Sidereal Time

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Version Published Release Notes
1.2.0.0

Updated mean obliquity of elliptic equation to be consistent with units. All units in this equation are in degrees.

1.1.0.0

Fixed bug which would re-size the input vector to [N x 1]
1.0.0.0