DC Power Supply: Turns Ratio Calculation
The answer is in your simulation voltage source. The 120VAC is quoted as RMS which is \$1\over\sqrt{2}\$ times the peak value, so the simulation uses 170V as the peak voltage (340Vp-p) 60Hz.
That's what comes out of the wall in North America.
So use the peak voltage in your calculation (169.7 or 170V) rather than 120V.
In general, if you see a power source given in volts AC it will usually mean RMS unless otherwise specified. For a sine wave the ratio of peak to RMS is \$\sqrt{2}\$. For other waveforms it generally differs.