COMPARISON BETWEEN THE VARIABLES AND PARAMETERS …
The equinox based precession-nutation parameters refer either to the ecliptic of date, or the ecliptic of epoch (e.g. J2000.0). Figure 2 shows a number of those parameters, e.g. ψA, ωA, which refer to the ecliptic and equinox of epoch, ǫA, zA and the usual nutation angles, ∆ψ, ∆ǫ, which refer to the ecliptic and (mean or true) equinox of date, and χA +∆χA that measures the ...
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