Step 1: Understanding Sati Pratha.
Sati was an old social practice in which a widow was compelled to sacrifice herself on her husband's funeral pyre. It was widely criticized for being inhumane and oppressive.
Step 2: Legislative action.
The Sati Regulation Act (also called Bengal Sati Regulation, 1829) was introduced by Lord William Bentinck, the Governor-General of India, to abolish the practice.
Step 3: Clarification of year.
While the regulation came into force in 1829 in Bengal Presidency, many sources also note earlier discussions in 1828. However, the accepted year of its formal passage is 1829.
Step 4: Conclusion.
Thus, the Sati Pratha Act was passed in 1829 (historically correct).
Final Answer: