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Chapter topics:
- Maa pöörleb ja tiirleb
- 1. Sissejuhatus
- 2. Miks vahelduvad päev ja öö?
- 3. Miks vahelduvad aastaajad?
- 4. Päikesevarjutus
- 5. Kuuvarjutus
- 6. Kokkuvõte
- Lisamaterjal
- Kodutöö ja tunni kirjeldus
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