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This HP Prime program calculates Greenwich apparent sidereal time. Apparent sidereal time is the angular location of Greenwich or the prime meridian with respect to the vernal equinox. It is the inertial location, measured positive along the equator in the direction of the Earth's rotation.

Here is the output from this program.

demo_gast - Greenwich apparent sidereal time

calendar date

month 12
day 13.78452
year 2013

julian date = 2456640.28452

apparent sidereal time 5.04403159964 degrees
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