When a tiny crescent of the moon is visible right before sunrise, it means that the moon is waning since it is contracting at that time.
Before dawn, you can see a waning crescent moon in the east, also referred to as an old moon. A fading crescent moon will gradually reveal less and less of its illuminated side, or day side, with each new morning. As it approaches the new moon, when the moon will lie between the Earth and the sun, it rises closer to the sunrise each day. Around 2:00 a.m., a broad-waning crescent usually appears. although on occasion at midnight. In complete darkness, just before dawn's twilight, a thin crescent appears. Only in the early morning twilight does a slender crescent appear, and it is always low in the sky. The declining crescent phase is visible in the Northern Hemisphere as a tiny crescent of light on the left. The Moon exhibits these eight phases sequentially as it completes its monthly cycle. The Moon orbits the Earth in 27 days. Therefore, the lunar cycle lasts 27 days.
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