12-03-2016, 08:33 PM

This HP Prime computer program, demo_sun1, calculates the geocentric coordinates of the sun for a julian date provided by the user. It demonstrates how to interact with a routine called sun1 which performs the calculations.

Here's the program output for a typical example.

March 9, 2016

solar right ascension = 349.753879691 degrees

solar declination = −4.40887923376 degrees

solar eci position vector and magnitude (km)

r_x = 145728172.508

r_y = −26341756.0806

r_z = −11417974.8714

rmag = 148529318.742

Here's the program output for a typical example.

March 9, 2016

solar right ascension = 349.753879691 degrees

solar declination = −4.40887923376 degrees

solar eci position vector and magnitude (km)

r_x = 145728172.508

r_y = −26341756.0806

r_z = −11417974.8714

rmag = 148529318.742