You can obtain this data (and other solar system data) to high accuracy using the HORIZONS software by NASA.

You can obtain this data (and other solar system data) to high accuracy using the HORIZONS software by NASA.

Use the following settings:

• Ephemeris Type: VECTORS
• Target Body: Earth [Geocenter] [399]
• Coordinate Origin: Sun (body center) [500@10]

This will generate the position and velocity of Earth relative to the Sun at the specified time(s). More settings can be adjusted using Table Settings.