Nigel Cattlin / Crescent-cup liverwort (Lunularia cruciata), close up. Berkshire, England, UK. January.

David Fleetham / Molokini Crater, aerial shot of charter boats in crescent shaped islet. Maui, Hawaii. January 2018.

David Pattyn / Partial eclipse of the sun, Anjajavy Private Reserve, north west Madagascar, September 2016.

David Pattyn / Partial eclipse of the sun, Anjajavy Private Reserve, north west Madagascar, September 2016.

Ashley Cooper / Dark clouds moving infront of waxing crescent moon at sunset, Ambleside, Lake District, UK.

David Fleetham / Aerial shot of the inside of the crescent shaped islet with charter boats on moorings, Molokini Marine Preserve, Maui, Hawaii. Seven images were combined for this panorama.

Shane Gross / Sea cucumber (Holothuroidea) larva amongst Plankton at night. The Bahamas.