Half-month

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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).

Half-month
A B C D E F G H J K L M N O P Q R S T U V W X Y
Jan 1-15 Jan 16-31 Feb 1-15 Feb 16-28/29 Mar 1-15 Mar 16-31 Apr 1-15 Apr 16-30 May 1-15 May 16-31 Jun 1-15 Jun 16-31 Jul 1-15 Jul 16-31 Aug 1-15 Aug 16-31 Sep 1-15 Sep 16-30 Oct 1-15 Oct 16-31 Nov 1-15 Nov 16-30 Dec 1-15 Dec 16-31

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