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- Season 0 1966-12-25
- Season 1 1964-02-04
- Season 2 1965-01-06
- Season 3 1966-01-02
- Season 4 1967-01-17
- Season 5 1968-01-02
- Season 6 1969-01-02
- Season 7 1970-01-05
- Season 8 1971-01-04
- Season 9 1972-01-03
- Season 10 1973-01-04
- Season 11 1974-01-07
- Season 12 1975-01-20
- Season 13 1976-01-05
- Season 14 1977-01-07
- Season 15 1978-01-06
- Season 16 1979-02-26
- Season 17 1980-01-14
- Season 18 1981-01-05
- Season 19 1982-01-11
- Season 20 1983-01-10
- Season 21 1984-01-09
- Season 22 1985-01-07
- Season 23 1986-01-06
- Season 24 1987-01-05
- Season 25 1988-01-04
- Season 26 1989-01-09
- Season 27 1990-01-08
- Season 28 1991-01-07
- Season 29 1992-01-06
- Season 30 1993-01-04
- Season 31 1994-01-10
- Season 32 1995-01-09
- Season 33 1996-01-08
- Season 34 1997-02-27
- Season 35 1998-02-19
- Season 36 1999-01-28
- Season 37 2000-01-12
- Season 38 2001-01-25
- Season 39 2002-01-10
- Season 40 2003-01-09
- Season 41 2004-01-08
- Season 42 2005-01-13
- Season 43 2006-01-12
- Season 44 2007-03-13
- Season 45 2008-01-15
- Season 46 2009-01-26
- Season 47 2009-10-13
- Season 48 2010-09-27
- Season 49 2011-08-08
- Season 50 2012-07-23
- Season 51 2013-08-12
- Season 52 2014-08-18
- Season 53 2016-03-16
- Season 54 2017-01-19
- Season 55 2018-02-05
- Season 56 2019-01-23
- Season 57 2020-01-16
- Season 58 2021-01-04
- Season 59 2022-03-31
- Season 60 2024-07-22
Season 60 Episode
- Season 13 The Transplant Experience
- Season 13 Intimate Strangers
- Season 13 A Fair Share of What Little We Have
- Season 13 The Incredible Machine
- Season 13 King Coal Revived
- Season 13 A Question of Trust
- Season 13 The Case of the Bermuda Triangle
- Season 13 The Lords of the Labyrinth
- Season 13 Inside the Shark
- Season 13 The Chemical Dream
- Season 13 The Edelin Affair
- Season 13 The World of Margaret Mead
- Season 13 The Pathway from Madness
- Season 13 Geronimo's Children
- Season 13 The Vision of the Blind
- Season 13 A Lesson for Teachers
- Season 13 Why Did Stuart Die?
- Season 13 The Children of Peru
- Season 13 Dying
- Season 13 A Home Like Ours... A Story of Four Children
- Season 13 What's Wrong with the Sun?
- Season 13 The Bull's Eye War
- Season 13 The Hot-Blooded Dinosaurs
- Season 13 Billion Dollar Bubble
- Season 13 The Selfish Gene
- Season 13 A Child of Our Own
- Season 13 Secrets of a Coral Island
- Season 13 The Long Valley
- Season 13 Half-Way to 1984
- Season 13 The Mystery of King Arthur and His Round Table
Horizon - Season 13 Episode 21 What's Wrong with the Sun?
7.30 60 minutes In the episode, Horizon explores the history of man's understanding of the sun's structure and observations in recent years.
