{ "item_title" : "天", "item_author" : [" ゲルダート "], "item_description" : "空という巨大なドームは、地球の重力井戸が形成する湾曲した空間を象徴しています。著者は、数式を用いた計算と実際の観測とを対比させながら、地平線までの距離をどのように測定するかを考察しています。地球の半径と質量の双方が、その要因となり得ます。The great dome of the sky represents the curved space of the gravitational well of the Earth. The author considers how we measure the distance to the horizon using a formula vs actual observation. Both the radius and the mass of the Earth may be factors.", "item_img_path" : "https://covers1.booksamillion.com/covers/bam/1/92/703/233/1927032334_b.jpg", "price_data" : { "retail_price" : "14.00", "online_price" : "14.00", "our_price" : "14.00", "club_price" : "14.00", "savings_pct" : "0", "savings_amt" : "0.00", "club_savings_pct" : "0", "club_savings_amt" : "0.00", "discount_pct" : "10", "store_price" : "" } }

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