1978 (MCMLXXVIII) was a common year starting on Sunday of the Gregorian calendar, the 1978th year of the Common Era (CE) and Anno Domini (AD) designations, the 978th year of the 2nd millennium, the 78th year of the 20th century, and the 9th year of the 1970s decade.

1977 (MCMLXXVII) was a common year starting on Saturday of the Gregorian calendar, the 1977th year of the Common Era (CE) and Anno Domini (AD) designations, the 977th year of the 2nd millennium, the 77th year of the 20th century, and the 8th year of the 1970s decade.