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A half-month is a unit of time typically used in astronomy. Each month is separated into two parts: *days 1–15, *day 16 until the end of the month. Unidentified celestial objects, such as comets and asteroids, are given designations that contains the half-month as a letter of the English alphabet. For example, an object seen in the second half of January would be identified with the letter B; if seen in the first half of February, the letter would be C. The letter I is not used, to prevent confusion with the number 1. Instead, the letters proceed from H (April 16-30) to J (May 1-15). == See also == * Provisional designation in astronomy * Naming of comets * Fortnight 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Half-month」の詳細全文を読む スポンサード リンク
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