### SLA_EARTH

Approx Earth Pos/Vel

ACTION:
Approximate heliocentric position and velocity of the Earth (single precision).
CALL:
CALL sla_EARTH (IY, ID, FD, PV)
##### GIVEN:
 IY I year ID I day in year (1 = Jan 1st) FD R fraction of day

##### RETURNED:
 PV R(6) Earth $\left[\phantom{\rule{0.3em}{0ex}}x,y,z,ẋ,ẏ,ż\phantom{\rule{0.3em}{0ex}}\right]$ (AU, AU s${}^{-1}$)

NOTES:
(1)
The date and time is TDB (loosely ET) in a Julian calendar which has been aligned to the ordinary Gregorian calendar for the interval 1900 March 1 to 2100 February 28. The year and day can be obtained by calling sla_CALYD or sla_CLYD.
(2)
The Earth heliocentric 6-vector is referred to the FK4 mean equator and equinox of date.
(3)
Maximum/RMS errors 1950-2050:
• 13/5 $×1{0}^{-5}$ AU = 19200/7600 km in position
• 47/26 $×1{0}^{-10}$ AU s${}^{-1}$ = 0.0070/0.0039 km s${}^{-1}$ in speed
(4)
More accurate results are obtainable with the routines sla_EVP and sla_EPV.