Season
- Season 0 1982-09-06
- Season 1 1958-10-16
- Season 2 1965-09-20
- Season 3 1966-09-19
- Season 4 1967-09-25
- Season 5 1968-09-23
- Season 6 1969-09-15
- Season 7 1970-09-15
- Season 8 1971-09-13
- Season 9 1972-09-11
- Season 10 1973-09-10
- Season 11 1974-09-09
- Season 12 1975-09-08
- Season 13 1976-09-13
- Season 14 1977-09-12
- Season 15 1978-09-11
- Season 16 1979-09-10
- Season 17 1980-09-08
- Season 18 1981-09-14
- Season 19 1982-09-13
- Season 20 1983-09-12
- Season 21 1984-09-10
- Season 22 1970-01-01
- Season 23 1970-01-01
- Season 24 1970-01-01
- Season 25 1970-01-01
- Season 26 1970-01-01
- Season 27 1970-01-01
- Season 28 1970-01-01
- Season 29 1970-01-01
- Season 30 1970-01-01
- Season 31 1970-01-01
- Season 32 1970-01-01
- Season 33 1970-01-01
- Season 34 1970-01-01
- Season 35 1991-09-09
- Season 36 1970-01-01
- Season 37 1970-01-01
- Season 38 1970-01-01
- Season 39 1970-01-01
- Season 40 1970-01-01
- Season 41 1970-01-01
- Season 42 1970-01-01
- Season 43 1970-01-01
- Season 44 1970-01-01
- Season 45 1970-01-01
- Season 46 1970-01-01
- Season 47 1970-01-01
- Season 48 1970-01-01
- Season 49 1970-01-01
- Season 50 1970-01-01
- Season 51 1970-01-01
- Season 52 1970-01-01
- Season 53 1970-01-01
- Season 54 1970-01-01
- Season 55 1970-01-01
- Season 56 1970-01-01
- Season 57 1970-01-01
- Season 58 1970-01-01
- Season 59 1970-01-01
- Season 60 2018-01-04
- Season 61 1970-01-01
- Season 62 1970-01-01
- Season 63 1970-01-01
- Season 64 1970-01-01
- Season 65 1970-01-01
- Season 66 1970-01-01
- Season 67 1970-01-01
- Season 68 2025-09-05
Season 68 Episode
- Season 21 Episode 1
- Season 21 Episode 2
- Season 21 Episode 3
- Season 21 Episode 4
- Season 21 Episode 5
- Season 21 Episode 6
- Season 21 Episode 7
- Season 21 Episode 8
- Season 21 Episode 9
- Season 21 Episode 10
- Season 21 Episode 11
- Season 21 Episode 12
- Season 21 Episode 13
- Season 21 Episode 14
- Season 21 Episode 15
- Season 21 Episode 16
- Season 21 Episode 17
- Season 21 Episode 18
- Season 21 Episode 19
- Season 21 Episode 20
- Season 21 Episode 21
- Season 21 Episode 22
- Season 21 Episode 23
- Season 21 Episode 24
- Season 21 Episode 25
- Season 21 Episode 26
- Season 21 Episode 27
- Season 21 Episode 28
- Season 21 Episode 29
- Season 21 Episode 30
- Season 21 Episode 31
- Season 21 Episode 32
- Season 21 Episode 33
- Season 21 Episode 34
- Season 21 Episode 35
- Season 21 Episode 36
- Season 21 Episode 37
- Season 21 Episode 38
- Season 21 Episode 39
- Season 21 Episode 40
- Season 21 Episode 41
- Season 21 Episode 42
- Season 21 Episode 43
- Season 21 Episode 44
- Season 21 Episode 45
- Season 21 Episode 46
- Season 21 Episode 47
- Season 21 Episode 48
- Season 21 Episode 49
- Season 21 Episode 50
- Season 21 Episode 51
- Season 21 Episode 52
- Season 21 Episode 53
- Season 21 Episode 54
- Season 21 Episode 55
- Season 21 Episode 56
- Season 21 Episode 57
- Season 21 Episode 58
- Season 21 Episode 59
- Season 21 Episode 60
- Season 21 Episode 61
- Season 21 Episode 62
- Season 21 Episode 63
- Season 21 Episode 64
- Season 21 Episode 65
- Season 21 Episode 66
- Season 21 Episode 67
- Season 21 Episode 68
- Season 21 Episode 69
- Season 21 Episode 70
- Season 21 Episode 71
- Season 21 Episode 72
- Season 21 Episode 73
- Season 21 Episode 74
- Season 21 Episode 75
- Season 21 Episode 76
- Season 21 Episode 77
- Season 21 Episode 78
- Season 21 Episode 79
Blue Peter - Season 21 Episode 10
7.60 25 minutes Straight Down the Line!: Simon tracks down the most famous line in the world, the zero line of longitude - otherwise known as the Greenwich Meridian - that celebrates its centenary next Saturday. Most visitors to Greenwich admire the famous Time Ball dropped one hour after noon each day-now is your chance to see how it works and why Greenwich Mean Time is of worldwide importance.
