Calendars of Other Worlds

The Sky at Night – Season 12

Leap Year makes this a special month-but variations in earthly calendars are slight compared with those in other worlds. In tonight's programme, Patrick Moore talks about Uranus's 65,000-day year, Jupiter's 'year', twelve times as long as ours but with a 'day' of less than ten hours, and Venus's 'year', which seems shorter than its 'day'.