Moon Phases was a Darkover fanzine edited first by Ingrid Maack and the, from issue #7 onwards, by Nina Boal. According to some sources he first issue was printed in July 1981, but in fact, issue #4 was published in July 1981. After that, the fanzine appeared more or less annually until 1993, when the last issue, #15 was published. 
Issue 13 was published in 1989, before the issue 12 which was published in 1991. 
Issue 12 was published in 1991, after issue 13. The issue consisted of a single novel Masks by Jean Lamb.
Moon Phases folded down after issue #15, following the Marion Zimmer Bradley Fan Fiction Controversy caused by Moon Phases issue 12.