Science Class 7
Earth, Moon, and the Sun
Two motions, one hidden face, and the rare line-up that makes an eclipse.
19 lessons · ~97 min total
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Lessons in this topic
- 0 Start here Two motions of Earth, one face of the Moon, and the line-up that makes an eclipse. · 3 min You are here
- 1 Earth is doing two things at once Earth turns once a day. It goes round the Sun once a year. · 5 min
- 2 The Moon keeps one face turned to us The Moon turns once in each trip round Earth. So one face always points at us. · 6 min
- 3 When three line up, one shades another A body in the way makes a shadow. If it lands on another body, that is an eclipse. · 6 min
- 4 The Moon shades a patch of Earth In a solar eclipse the Moon is between the Sun and Earth. Its shadow lands on a small part of Earth. · 6 min
- 5 Earth shades the Moon In a lunar eclipse Earth is between the Sun and the Moon. Earth shades the Moon. · 6 min
- 6 Why it is not every month The Moon's path is tilted about 5°. At most New Moons, its shadow misses Earth. · 6 min
- 7 One is safe to watch, the other never is Never look straight at the Sun, even in an eclipse. A lunar eclipse is safe to watch. · 6 min
- 8 Checkpoint: motions, the Moon and eclipses A quick graded check on the first seven ideas. · 4 min
- 9 Why the Sun seems to move Earth turns west to east. So the Sun seems to cross the sky. · 5 min
- 10 Day here, night there Half of Earth is lit. The east sees sunrise first. · 5 min
- 11 The star that stays still One star seems to stand still. The others circle it. · 5 min
- 12 Checkpoint: the turning sky A quick graded check on the turning Earth and the Pole Star. · 4 min
- 13 The night sky changes through the year A star rises about 4 minutes earlier each night. · 5 min
- 14 The tilt makes the seasons The axis leans. The lean and the round shape make seasons. · 5 min
- 15 The longest and shortest days The north has its longest day near 21 June. · 5 min
- 16 Checkpoint: the year, the tilt and the seasons A quick graded check on the year, the tilt and the seasons. · 4 min
- 17 The big picture The whole chapter on one screen. Every idea is a motion, a tilt or a shadow. · 4 min
- 18 Track quiz A cheat-sheet of the rules, then one question per idea. · 7 min
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