Our Mr. Sun (1956)
by Frank Capra
From the description in Rick Prelinger's Field Guide to Sponsored Films:
Popular scientific film directed by Frank Capra that launched the Bell System Science series. Combining animation and live action, Our Mr. Sun uses a scientist-writer team to present information about the sun and its importance to humankind. NOTE: Produced in Technicolor, the film was originally telecast in 1956 and 1957 to 9 million homes; some 600 16mm prints were distributed to schools and community organizations through the Bell Telephone System film libraries.
One entry in a series of films produced to make science accessible to the masses--especially children--this film describes the sun in scientific but entertaining terms. Our Mr. Sun is a Scientific film designed for children that teaches about how the sun works and presents it in an amusing way. It combines Live action with Animation.