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Saat Matahari bergerak melintasi langit akibat rotasi planet ini, bayangan yang dihasilkan oleh benda-benda tetap di permukaan juga berubah arah dan panjangnya. Dan perubahan ini tidak linier, tapi melengkung, tepatnya karena bentuk Bumi yang bulat. Fenomena ini memiliki penjelasan ilmiah yang sederhana dan telah diamati sejak zaman kuno. Sekitar tahun 240 SM, astronom Yunani, Eratosthenes, menggunakan perbedaan sudut bayangan antara dua kota (Siena dan Alexandria) untuk menghitung keliling Bum...
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