Science Class 8
Keeping Time with the Skies
Where a day, month and year came from, and why no calendar fits them evenly.
13 lessons · ~68 min total
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Lessons in this topic
- 0 Start here The Sun, the Moon and the seasons give us a day, a month and a year. · 3 min You are here
- 1 Where a day came from The Earth spins, so the Sun seems to rise and set. That gives a day. · 5 min
- 2 A shadow that tells the time A stick shadow is shortest when the Sun is highest. That measures a day. · 5 min
- 3 Where a month came from The Moon shows phases as it goes round the Earth. One cycle takes about a month. · 6 min
- 4 Where a year came from The Earth goes round the Sun. The seasons repeat, and that repeat is a year. · 5 min
- 5 They do not divide Twelve Moon months are about 11 days shorter than a solar year. · 5 min
- 6 A spare day every few years A leap day in most fourth years keeps a solar calendar in step with the seasons. · 5 min
- 7 Calendars people use Solar, lunar and luni-solar calendars follow the sky in different ways. · 6 min
- 8 Where to look for the Moon Look for a waxing Moon at sunset. Look for a waning Moon at sunrise. · 6 min
- 9 Satellites above us Human-made satellites orbit the Earth and do jobs for us. · 6 min
- 10 Checkpoint: the Moon in the sky and satellites A graded check on the Moon in the sky and on satellites. · 5 min
- 11 The big picture Nine ideas about days, months, years, calendars, the Moon and satellites. · 4 min
- 12 Track quiz The nine rules from the labs, then questions on each idea. · 7 min
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