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a Heliocentric osculating orbital elements, referred to the mean ecliptic and equinox of J2000.0. T0 is a recent date of passage through perihelion. b Elements are for the barycentre of the Earth-Moon system. SY, JY, and TY are Sidereal, Julian, and Tropical years, respectively, and are given in units of mean solar days (cf. §4.1.2). A Julian year has a length of 365.25 days, exactly. c Years of discovery for Uranus, Neptune, and Pluto, respectively: 1781, 1846, 1930.

a Heliocentric osculating orbital elements, referred to the mean ecliptic and equinox of J2000.0. T0 is a recent date of passage through perihelion. b Elements are for the barycentre of the Earth-Moon system. SY, JY, and TY are Sidereal, Julian, and Tropical years, respectively, and are given in units of mean solar days (cf. §4.1.2). A Julian year has a length of 365.25 days, exactly. c Years of discovery for Uranus, Neptune, and Pluto, respectively: 1781, 1846, 1930.

Table 2.10. A selection of premodern planetary parameters."

Table 2.10. A selection of premodern planetary parameters."

Planet/element

(AU)

T0 = a.d. 1/ T0 = a.d. 1549

e

w (°/d)

Sun

0 0

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