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Calculate Sun data from date (2)
caluculates B0 (radians), position angle and sun radius (arcsec)
B0 - heliographic latitude of the centre of disk
position angle - of the north end of the axis of rotation, measured +ve if east of the north point of the disk
radius - the apparent radus of the Sun in arcsec
This is created using the calculations from the IDL routine get_sun.pro
Created: 2011-02-15 | Last updated: 2011-03-02
Credits: Anja Le Blanc