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PENDAHULUAN

PENDAHULUAN. Orang sub- tropis : MUSIM  Kesadaran pentingnya waktu (?) Orang tropis : Sepanjang tahun , siang / malam sama panjang Sering ada pertanyaan , “ Kenapa sudah jam 18:30, langit masih terang ? ” Tidak peduli waktu  Jam Karet (?)

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PENDAHULUAN

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  1. PENDAHULUAN • Orang sub-tropis: • MUSIMKesadaranpentingnyawaktu(?) • Orangtropis: • Sepanjangtahun, siang/malamsamapanjang • Seringadapertanyaan, “Kenapasudah jam 18:30, langitmasihterang? ” • Tidakpeduliwaktu Jam Karet (?) • Waktudistandarkanseiringdenganberkembangnya (SEJARAH WAKTU) • EfekRotasiBumi • EfekRevolusibumi (PeredaranMatahari & Bulan)

  2. Peredaran Matahari & Bulan

  3. MUSIM

  4. SEJARAH WAKTU • Jam Matahari • Jam Pasir • Arloji / Jam Bandul • Hukum Kepler • Jam Quartz • Jam Atom

  5. Jam Matahari (rotasi Bumi) Bagaimana di malam hari…?

  6. Jam Pasir Rentang waktu vs ukuran jam?Siapa yang membalikkan…?

  7. Arloji / Jam Bandul Ukuran cukup besar Anomali gravitasi…?

  8. pendulum.mov

  9. Peredaran Matahari & Bulan • Hk Kepler  panjang “siang” berubah  tahun • Panjang tahun “tak habis dibagi” panjang bulan

  10. Jam Quartz • Kesalahan: 1 detik / 10 tahun

  11. quartz.mov

  12. Jam Atom • Kesalahan: 1 detik / 10 milyar tahun

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