precision ephemeris of the sun
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21-04-2016, 04:33 PM
Post: #1
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precision ephemeris of the sun
This HP Prime program demonstrates how to call a subroutine named sun2 which computes a precision ephemeris of the sun.
Here is the syntax for the routine EXPORT sun2(jdate) // precision ephemeris of the Sun // input // jdate = julian ephemeris date // output // rsun(1) = x-component of the eci position vector of the Sun (km) // rsun(2) = y-component of the eci position vector of the Sun (km) // rsun(3) = z-component of the eci position vector of the Sun (km) // rsun(4) = right ascension of the Sun (radians) // (0 <= rasc <= 2 pi) // rsun(5) = declination of the Sun (radians) // (-pi/2 <= decl <= pi/2) // // note // coordinates are inertial, geocentric, // equatorial and true-of-date // reference // Planetary Programs and Tables // by Pierre Bretagnon & Jean-Louis Simon and here is the screen display generated by the demo program. PRECISION EPHEMERIS OF THE SUN rsun_x = 128426556.337 km rsun_y = 71703229.3293 km rsun_z = 31080388.5969 km rmag = 150335371.833 km right ascension = 29.1755355809 deg declination = 11.9313969567 deg A PDF document included with the attached zip file has details of the algorithm. |
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precision ephemeris of the sun - cdeaglejr - 21-04-2016 04:33 PM
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