December 2021, day by day.

Dall sheep rams at Polychrome Pass, Denali National Park, Alaska (© Patrick J. Endres/Getty Images)

2021-12-01

Autumn leaves coated with frost (© sagarmanis/Getty Images)

2021-12-02

Eastbourne Pier, East Sussex, England (© Robert Harding World Imagery/Offset by Shutterstock)

2021-12-03

Navy Day celebration at Gateway of India, Mumbai (© Dinodia Photos/Alamy Stock Photo)

2021-12-03

Mother cheetah and her cub in the Maasai Mara nature reserve, Kenya (© gudkovandrey/Adobe Stock)

2021-12-04

Salzburg with Salzach river, Austria (© MacEaton/Alamy)

2021-12-04

An 1840 design for the Analytical Engine by Charles Babbage (© Science & Society Picture Library/Getty Images)

2021-12-05

Glastonbury Tor, Somerset, England (© DEEPOL by plainpicture/Adam Burton)

2021-12-06

Vancouver Christmas Market, Jack Poole Plaza, Vancouver (© Michael Wheatley/Alamy Stock Photo)

2021-12-07

US Navy sailors on the WWII museum ship USS Bowfin in Honolulu, Hawaii (© US Navy Photo/Alamy)

2021-12-07

Château du Haut-Kœnigsbourg, Alsace, France (© Leonid Andronov/Shutterstock)

2021-12-07

Petrified Forest National Park, Arizona (© Ian Shive/Tandem Stills + Motion)

2021-12-07

Glowworms in Blue Mountains National Park, Australia (© Leelakajonkij/Getty Images)

2021-12-08

Arctic fox in Dovrefjell-Sunndalsfjella National Park, Norway (© Andy Trowbridge/Minden Pictures)

2021-12-09

The shadow of Mount Everest over the western Himalayas in Nepal (© Kent Karvey/KH Films, Inc./Tandem Stills + Motion)

2021-12-10

Wicker fields in Cañamares, Spain (© David Santiago Garcia/Alamy)

2021-12-11

Old Town and El Panecillo Hill in Quito, Ecuador (© Karol Kozlowski/plainpicture)

2021-12-12

American robin perched on a branch in Canada (© marcophotos/Getty Images)

2021-12-13

The chapel and hermitage of Santa Justa in Cantabria, Spain (© Luis Miguel Martin/Getty Images)

2021-12-14

Indian rhinoceros in Kaziranga National Park, India (© Abhishek Singh/Moment/Getty Images)

2021-12-15

Star trail photography taken in Yellowknife (© Seong-won Jang/EyeEm/Getty Images)

2021-12-16

Christmas-themed beach huts in Bournemouth, England (© Allouphoto/Alamy)

2021-12-16

Toronto Christmas Market at the Distillery District (© robertharding/Alamy Stock Photo)

2021-12-17

The December full moon seen through holiday lights (© Jesus Merida/Getty Images)

2021-12-17

Riquewihr, Haut-Rhin, France (© Walter Bibikow/eStock Photo)

2021-12-18

Anjuna Beach in Goa, India (© Dmitry Rukhlenko/Shutterstock)

2021-12-18

Aurora borealis above the Brooks Range in Alaska (© Noppawat Tom Charoensinphon/Getty Images)

2021-12-19

Performers dressed as Santa Claus from the Ministry of Fun Santa School in London, England (© Matt Dunham/AP Photo)

2021-12-19

Linn of Quoich, Aberdeenshire, Scotland (© AWL Images/Danita Delimont)

2021-12-20

Sunlight in the forest of Western Siberia, near the city of Raduzhny, Russia (© Leonid Ikan/Shutterstock)

2021-12-21

Winter scene illuminated on the Palais de l'Isle in Annecy, Haute Savoie, France (© blickwinkel/Alamy)

2021-12-21

Two young male polar bears, Churchill, Manitoba, Canada (© Cheryl Ramalho/Getty Images)

2021-12-22

Jog Falls in Karnataka, India (© Rajesh Vijayarajan Photography/Moment Open/Getty Images)

2021-12-23

Christmas tree at Weissensee, a small lake near Ehrwald in Tyrol, Austria (© nagelestock/Alamy)

2021-12-24

The Rougier de Camarès, Aveyron, France (© Eric Teissedre/Photononstop/Alamy Banque d'Images)

2021-12-24

Trees on the northern slope of Mount Khomyak in the Carpathian Mountains, Ukraine (© panaramka/Getty Images)

2021-12-24

Royal Pavilion Ice Rink in Brighton, England (© Chris Gorman/Getty Images)

2021-12-25

Snow buntings flock during a snowstorm in New York (© Marie Read/Minden Pictures)

2021-12-26

Salehurst, East Sussex, England (© JohnnyPowell/iStock/Getty Images Plus)

2021-12-26

Kjell Henriksen Observatory in Svalbard, Norway (© Vincent Fournier/Gallery Stock)

2021-12-27

Mountain goats in the Yukon, Canada (© Mark Newman/Getty Images)

2021-12-28

Westerheversand Lighthouse in Westerhever, Germany (© Sandra Bartocha/Minden Pictures)

2021-12-29

Rue du Petit-Champlain at Lower Old Town (Basse-Ville), Quebec City (© Diego Grandi/Shutterstock)

2021-12-29

Bonfire to celebrate New Year's Eve in 2014 in Reykjavik, Iceland (© Ragnar Th Sigurdsson/Alamy)

2021-12-30

Harp seal sleeping at Jones Beach, Long Island, New York (© Vicki Jauron, Babylon and Beyond Photography/Getty Images)

2021-12-31

Mehrangarh Fort, Rajasthan, India (© Avigator Fortuner/Shutterstock)

2021-12-31