It's time to see the thin Moon

BEST TIME TO SEE: 5 July, approximately 40 minutes before sunrise or 6 July, approximately 30 minutes after sunset

There are two opportunities to spot a thin Moon at the start of July, the first in the dawn sky on 5 July and the second in the evening sky on 6 July. A thin Moon is one that occurs immediately before or after new Moon. In order to be seen at all, the timing has to be just right to place a Moon which is greater than the Danjon limit within evening or morning twilight. The Danjon limit states how far the Moon needs to be away from the Sun to be seen. The Moon isn't perfectly smooth; its rough surface is littered with craters, mountains and valleys that break up the thin arc of light close to new Moon and limit its visibility. The Danjon limit states that…

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BBC Sky at Night United Kingdom (Digital) - 1 Issue, July 2024

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