The 72-year-old actor -- who tied the knot on June 3, 1973 with the actress-politician -- said though Jaya is abroad on the occasion, they still feel very close to each other.
"Self wishes are the order of the day... They serve both ways. They convey to you the Ef, of my marriage anniversary... And they inform the wife that she has not been forgotten even though she is not in the country at this moment," Bachchan wrote in his blog.
Bachchan and Jaya have two children -- Abhishek and daughter Shweta.
"After 42 years it all seems so very close and immediate ... The decision to be together... The information to the elders... Parents first and then .. Khwaja Ahmed Abbas, my first director and then Hrishikesh Mukherjee, Jaya's first director, and ours for many films thereafter," the "Piku" actor added.
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Bachchan recalled his traditional Bengali wedding and their honeymoon in London.
"And finally after it was all over, the entrance of the bride into our home and the departure soon after to London with some dear friends for a honeymoon... Our very first visit to the UK," wrote Bachchan.
Bachchan and Jaya worked together in films like "Bansi Birju", "Abhimaan", "Chupke Chupke", "Mili", "Sholay" and "Silsila" and "Kabhi Khushi Kabhie Gham".