A couple of things.
C3 and C1 form a 100-to-1 attenuator. Calculate the impedance of both at 1 Hz to see how this is.
C2 also is too small for a 1 Hz signal. Its impedance at 1 Hz should be less than 10% of R1, preferably less than 1%.
The connection from the 4.5V divider to the opamp + input pin should be a resistor. Start with 100K. This prevents an AC interaction between the input and the Vcc/2 decoupling capacitor C1.
ak
C3 and C1 form a 100-to-1 attenuator. Calculate the impedance of both at 1 Hz to see how this is.
C2 also is too small for a 1 Hz signal. Its impedance at 1 Hz should be less than 10% of R1, preferably less than 1%.
The connection from the 4.5V divider to the opamp + input pin should be a resistor. Start with 100K. This prevents an AC interaction between the input and the Vcc/2 decoupling capacitor C1.
ak