Definitions: Throat, foxing, and platform are parts of a(n) ________.?

Questions

Japanese Junko Tabei became first woman to reach Mt Everest's summit.?

Sammy Davis, Jr., "The Complete Entertainer", dies of throat cancer.?

Later that day, Jim Henson, creator of the Muppets, dies from pneumonia and complications.?

7th recorded perihelion passage of Halley's Comet.?

Liberius begins his reign as Catholic Pope.?