These are only needed for concentrators that require more accurate tracking of the sun.įor instance the SPA algorithm 2( ) uses:ĭOmega=2.1429-0.0010394594*dElapsedJulianDays ĭMeanLongitude = 4.8950630+ 0.017202791698*dElapsedJulianDays They are referred to the equinoxes instead so use sin instead of cos.įinally, there are many algorithms for more accurate determinations of declination angle to account for the elliptic and yearly movement of the earth's orbit.
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