The size of Sun and distance from Earth:
Diameter of Sun 1392700 km 
Angular diameter of Sun as seen from Earth, omega = 0.533056 degr
Distance of Sun from earth L = Sun radius/tan(omega/2)= 149694072 km 

Light velocity = 299792458 m/s
Light migrates in 499.3 sec = 8 minutes 19.3 sec from Sun to Earth

We calculate now the acceleration of Earth toward Sun:
We assume a circular orbit with constant speed of Earth to make it easier to calculate.
Earth travels 2pi*L =  9.406E+08 km around the Sun during a year
This is in average  2.575E+06 km during a day
This corresponds to an average velocity  29804 m/s
Earth travels a = 0.9856 degrees a day around the Sun 
Earth is falling with a constant speed v2 towards Sun.
v2 = 2v1*sin(a/2) = 512.7 m/s
The speed v2 is caused by the acceleration a1 of Earth toward Sun 
a1 = v2/24 hours = 5.934E-03 m/s^2

Next we calculate gravitation G on the surface of Sun:
G is increasing in proportion to the square of the decreasing distance to Sun.
Distance of Sun from Earth L = 214.97 x Sun radius 
G = a1*(L / Sun radius)^2 = 5.934E-03*214.97^2 = 274.224 m/s^2
G = 27.95 x g on Earth (9.811 m/s^2)