U.S. Ambassador to Moscow Arthur Hartman appeared on nationwide Soviet television yesterday, speaking of hopes for a technological dialogue between the superpowers. Last year and in 1980, the American envoy was refused the opportunity of speaking on his national day because Moscow objected to parts of the speech.

The Communist Party newspaper Pravda and the government's Izvestia, meanwhile, carried on their front pages a telegram from the Presidium to President Reagan offering "congratulations and wishes of peace and prosperity for the American people."

On Hartman's speech, United Press International noted that the Soviet media often attacks U.S. technological advances in the development of space-based and other weapons. While Hartman made no direct reference to weapons or to the stalled Geneva arms talks, he said, "In opening our eyes to inventions previously unimagined, science has forced us to reexamine such basic questions as how we can best assure the security of a world which, unfortunately, remains divided."

Nicaraguan President Daniel Ortega, in a letter to Reagan published on the holiday, called for resumption of talks intended to normalize relations. "Let this anniversary be a time of reflection for both of our governments," Reuter quoted him as saying. Washington suspended the talks in January.

In Manila, 6,000 demonstrators marched to the heavily guarded U.S. Embassy and thousands more protested in provincial cities, denouncing "U.S. imperialism" on Philippine-American Friendship Day.