How far is the earth from the sun?
International Astronomical Union (IAU) average a =149597871 km. Least distance, perihelion = 147098074 km and maximum, aphelion = 152097701 km
distance r at that instant can be approximated from
At vernal equinox, r = semi latus rectumm l =
0.0167086 is the eccentricity e of the Earth's orbit and this
approximation is differing in different sources. In brief, all these data
used.might not be the same, uniformly, in all the sources, when we
look for more significant digits.
There are limitations, like 0.001 sec, in angular measurements. This
is the reason for the variations. in lower significant digits (lsd)..