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Cara Mudah dan Aman Melihat Gerhana Bulan Total Gerhana Bulan Total akan menyapa seluruh negara di Asia, termasuk Indonesia, pada tanggal 28 Juli mendatang. Gerhana Bulan sendiri terjadi pada fase bulan purnama yaitu saat Matahari, Bumi, Bulan berada sejajar di bidang orbitnya masing-masing. Jika Gerhana Matahari Total membutuhkan filter agar sinar Matahari tidak merusak mata saat melihatnya, lalu bagaimana dengan Gerhana Bulan Total?
Untungnya, Gerhana Bulan Total dikenal sebagai salah satu peristiwa alam yang paling mudah untuk diamati. Tanpa filter apapun atau tanpa alat bantu pengamatan pun, siapa saja dapat mengamati Gerhana Bulan Total dengan mata telanjang, baik saat Gerhana Parsial, penumbra, atau total. Gerhana Bulan ini akan terlihat jelas selama langit cerah. Sementara itu, lokasi yang cocok untuk mengamati Gerhana Bulan ini di antara lain area lapangan luas, pantai, pegunungan, atau bahkan di atap gedung.
Lalu bagaimana dengan teleskop? Perlukah menggunakan teleskop untuk mengamati Gerhana Bulan Total?
Pada dasarnya, peralatan khusus semacam teleskop ini lebih sering digunakan oleh para astronom dan astrofotografer profesional. Mereka biasanya merekomendasikan binokuler atau teropong jika ingin melihat permukaan bulan dengan jelas saat terjadi gerhana. Dengan bantuan teropong, pengamatan akan menjadi lebih mudah saat melihat perubahan warna pada permukaan bulan saat bayangan bumi bergerak melewatinya.
Alat selanjutnya adalah teleskop. Teleskop akan membantu untuk melihat permukaan bulan dengan detail yang lebih jelas daripada teropong. Teleskop juga dapat dihubungkan ke kamera DSLR untuk mengabadikan foto bulan saat Gerhana dengan ukuran yang lebih besar daripada hanya dengan lensa kit.
Selain itu, mengetahui posisi bulan adalah hal yang penting dalam mengatamati gerhana. Karena bumi berotasi, maka pergerakan Bulan akan bergerak semu ke barat. Meskipun nantinya Bulan akan terlihat lebih kecil dari biasanya, tapi menemukan Bulan di langit bukanlah hal yang sulit. (infoastronomy.org)
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