Computer Ephemeris for 2020 from DE200/LE200.

First page.

Epoch T = J2020.5 = date 2020 Jul 2.125 (JD2459032.625) = besselian epoch B2020.50172

Beginning of spring: Mar 20   3h50.69m
             summer: Jun 20  21h44.81m
             autumn: Sep 22  13h31.85m   
             winter: Dec 21  10h 3.42m

Earth in perihelion: Jan 05   7.82h
         aphelion  : Jul 04  11.60h

Mean obliquity of ecliptic (eps) at J2020.5:
                        23.436625o = 23o26'11.85"
  Sin(eps) = 0.39773447          Cosec(eps) = 2.51424024
  Cos(eps) = 0.91750057            Sec(eps) = 1.08991758
  Tan(eps) = 0.43349779            Ctg(eps) = 2.30681685

Year precessional quantities for J2020.5:
     -- in right ascension    m =  46.1301"   =   3.07534s
     -- in declination        n =  20.0414"   =   1.33609s
     -- in longitude          p =  50.2955"   =   0.0139710o
     -- lunar/solar          p1 =  50.3888"   =   0.0139969o
     -- planetary            q1 =   0.1017"   =   0.0000282o

Ecliptic rotation:
   angular velocity of --        pi =   0.4699"    =   0.0001305o
   longitude of real axis of --  Pj = 175.0637o

Accumulated angle from J2000.0 to T:
-- precession in longitude        a =   1031.011"  =   0.286392o
-- of ecliptic rotation           b =      9.634"  =   0.002676o
-- precession in right ascension  M =      63.0445s
-- precession in declination      N =     410.8479"

Tm = (J2000.0 + T) / 2
180o - Pj + a/2  for Tm             c =   5.1731o
180o - Pj - a/2  for Tm             c'=   4.8868o

Matrix for transformation from J2000.0 to J2020.5
     0.99998751    -0.00458442    -0.00199193
     0.00458442     0.99998949    -0.00000457
     0.00199193    -0.00000457     0.99999802