Majalah Kuark Jenjang Olimpiade Level 3 Kelas 5–6 SD Kisah Ilmu – Sejarah Kalender
This issue explores the historical development of calendar systems from ancient civilizations to the modern Gregorian calendar. It introduces basic astronomical concepts underlying time measurement, including Earth's rotation and revolution and lunar cycles. Analytical exercises are included to support upper elementary students preparing for science olympiads.
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