The rising full moon is seen behind Christmas lights in Valletta, Malta December 23, 2018. REUTERS/Darrin Zammit Lupi TPX IMAGES OF THE DAY

A man dressed as Santa Claus pedals passengers in a rickshaw along Oxford Street, in London, Britain December 23, 2018. REUTERS/Hannah McKay

The Frauenkirche (Church of our Lady), the City Hall and the Christmas market on Marienplatz are seen behind raindrops on a fence in Munich, Germany, December 23, 2018. REUTERS/Andreas Gebert

The Frauenkirche (Church of our Lady), the City Hall and the Christmas market on Marienplatz are seen behind raindrops on a fence in Munich, Germany, December 23, 2018. REUTERS/Andreas Gebert

The Frauenkirche (Church of our Lady), the City Hall and the Christmas market on Marienplatz are seen behind raindrops on a fence in Munich, Germany, December 23, 2018. REUTERS/Andreas Gebert

A Palestinian woman displays a wax ornament she made for sale during Christmas season, in Ramallah the Israeli-occupied West Bank December 23, 2018. REUTERS/Raneen Sawafta

Iraqi Christians pray during Mass at St George Chaldean Catholic Church in Baghdad, Iraq December 23, 2018. REUTERS/Thaier Al-Sudani

An Iraqi Christian woman prays during Mass at St George Chaldean Catholic Church in Baghdad, Iraq December 23, 2018. REUTERS/Thaier Al-Sudani

Iraqi Christians pray during Mass at St George Chaldean Catholic Church in Baghdad, Iraq December 23, 2018. REUTERS/Thaier Al-Sudani

An Iraqi Christian prays during Mass at St George Chaldean Catholic Church in Baghdad, Iraq December 23, 2018. REUTERS/Thaier Al-Sudani

Iraqi Christians pray during Mass at St George Chaldean Catholic Church in Baghdad, Iraq December 23, 2018. REUTERS/Thaier Al-Sudani

Christian children play outside their home they returned to after being displaced by Islamic State militants in al-Hamdaniya, Iraq December 21, 2018. Picture taken December 21, 2018. REUTERS/Khalid al-Mousily

A Christian family decorates a Christmas tree at their home in al-Hamdaniya, Iraq December 22, 2018. Picture taken December 22, 2018. REUTERS/Khalid al-Mousily

Christians shop at a store selling Christmas decorations in al-Hamdaniya, Iraq December 21, 2018. Picture taken December 21, 2018. REUTERS/Khalid al-Mousily

Iraqis shop at a store selling Christmas decorations in Mosul, Iraq December 22, 2018. Picture taken December 22, 2018. REUTERS/Khalid al-Mousily

A general view of the St. Patrick's Cathedral is seen with its Christmas illumination in Karachi, Pakistan December 22, 2018. REUTERS/Akhtar Soomro

An aerial view shows a climber, dressed as Santa Claus, who decorates a 57-metre-high Christmas tree in a park on Tatyshev Island, located in the middle of the Yenisei River in the Siberian city of Krasnoyarsk, Russia December 17, 2018. REUTERS/Ilya Naymushin TPX IMAGES OF THE DAY

Participants dressed as Santa Claus take part in the annual race known as "Run Santa Run" at Fundidora Park in Monterrey, Mexico December 16, 2018. REUTERS/Daniel Becerril TPX IMAGES OF THE DAY

A figure of Santa Claus using a parachute is seen among Christmas decorations and lights on the facade of a house in San Gwann, Malta December 16, 2018. REUTERS/Darrin Zammit Lupi TPX IMAGES OF THE DAY

Toys depicting Santa Claus are seen at the Christmas market in Tallinn, Estonia December 9, 2018. REUTERS/Ints Kalnins

A woman looks at Christmas decorations in a shop in Rome, Italy, December 4, 2018. REUTERS/Max Rossi

People walk under trees decorated with Christmas lights at the Old Town Square in Prague, Czech Republic, December 2, 2018. REUTERS/David W Cerny TPX IMAGES OF THE DAY

Fireworks explode as a Christmas tree is illuminated in Byblos city in northern Lebanon, November 30, 2018. REUTERS/Jamal Saidi

Christmas decorations are displayed at a shop during the traditional Christkindelsmaerik (Christ Child market) near Strasbourg Cathedral, France, November 24, 2018. REUTERS/Vincent Kessler

A man walks on the shore of the Dead Sea, near Metzoke Dragot in the Israeli occupied West Bank, February 7, 2018. REUTERS/Ronen Zvulun SEARCH "ZVULUN DEADSEA" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A full moon rises behind Christmas decorations in Belgrade, Serbia, January 31, 2018. REUTERS/Djordje Kojadinovic

People walk in a boulevard after a heavy snowfall, with illumination lights seen in the foreground, in Moscow, Russia January 31, 2018. REUTERS/Tatyana Makeyeva

A Christmas tree next to a tree is seen on the flooded banks of the River Seine in Paris, France, after days of almost non-stop rain caused flooding in the country, January 27, 2018. REUTERS/Pascal Rossignol

A pigeon sits in a tree among holiday lights on Sixth Avenue in Manhattan, New York City, U.S. January 8, 2018. REUTERS/Andrew Kelly

Fireworks light the sky over a Christmas tree during Orthodox Christmas celebrations in the Siberian city of Krasnoyarsk, Russia January 7, 2018. REUTERS/Ilya Naymushin TPX IMAGES OF THE DAY

People watch fireworks lighting the sky during Orthodox Christmas celebrations in the Siberian city of Krasnoyarsk, Russia January 7, 2018. REUTERS/Ilya Naymushin

Fireworks light the sky over a Christmas tree during Orthodox Christmas celebrations in the Siberian city of Krasnoyarsk, Russia January 7, 2018. REUTERS/Ilya Naymushin

A woman holds a candle and the Bible during the Orthodox Christmas mass at the St. Clement Cathedral in Skopje, Macedonia, January 7, 2018. REUTERS/Ognen Teofilovski

People walk in front of the Holy Trinity cathedral a midnight Christmas service in Tbilisi, Georgia January 7, 2018. REUTERS/David Mdzinarishvili TPX IMAGES OF THE DAY

People walk in front of the Holy Trinity cathedral during a midnight Christmas service in Tbilisi, Georgia January 7, 2018. REUTERS/David Mdzinarishvili

People walk in front of the Holy Trinity cathedral a midnight Christmas service in Tbilisi, Georgia January 7, 2018. REUTERS/David Mdzinarishvili

People watch burning Yule logs in front of the Church of the Holy Mother of God during the eve of the Orthodox Christmas in Zenica, Bosnia and Herzegovina, January 6, 2018. REUTERS/Dado Ruvic

People dressed as the Three Kings parade through the streets during the Epiphany Day celebrations in Vilnius, Lithuania January 6, 2018. REUTERS/Ints Kalnins

A 'supermoon' full moon is seen through Christmas lights in Harpenden, Britain, January 1, 2018. REUTERS/Peter Cziborra

The 'supermoon' full moon is seen through Christmas lights in Valletta, Malta, January 1, 2018. REUTERS/Darrin Zammit Lupi

The 'supermoon' full moon is seen through Christmas lights in Valletta, Malta, January 1, 2018. REUTERS/Darrin Zammit Lupi

The 'supermoon' full moon is seen through Christmas lights in Valletta, Malta, January 1, 2018. REUTERS/Darrin Zammit Lupi

The 'supermoon' full moon is seen through Christmas lights in Valletta, Malta, January 1, 2018. REUTERS/Darrin Zammit Lupi

A dog dressed as Santa Claus takes part in the annual city race in Skopje, Macedonia December 24, 2017.REUTERS/Ognen Teofilovski TPX IMAGES OF THE DAY

People are seen on a pier in front of a giant illuminated Christmas ball in Larnaca, Cyprus December 19, 2017. REUTERS/Yiannis Kourtoglou TPX IMAGES OF THE DAY

A man poses as more than a hundred cyclists dressed as Santa Claus meet at the Colosseum in Rome, Italy December 17, 2017. REUTERS/Tony Gentile

A dog wears a Santa Claus hat as more than a hundred cyclists dressed as Santa Claus meet at the Colosseum in Rome, Italy December 17, 2017. REUTERS/Tony Gentile

A man is silhouetted as he walks past the Bank of England in the City of London, Britain, December 12, 2017. REUTERS/Clodagh Kilcoyne

Sezar, a Chihuahua, dressed in a Santa Claus suit walks in Nice, France, December 7, 2017. REUTERS/Eric Gaillard

A 10-foot long remote controlled flying Santa makes a test flight over the ocean in Carlsbad, California, U.S., December 3, 2017. REUTERS/Mike Blake TPX IMAGES OF THE DAY

The full moon is pictured behind Christmas lights in Marseille, France December 3, 2017. REUTERS/Jean-Paul Pelissier TPX IMAGES OF THE DAY

People look at Christmas decorations at a Christmas market in front of the Schoenbrunn palace in Vienna, Austria, December 3, 2017. REUTERS/Leonhard Foeger TPX IMAGES OF THE DAY

Christmas decorations are displayed for sale at a Christmas market in front of the Schoenbrunn palace in Vienna, Austria, December 3, 2017. REUTERS/Leonhard Foeger

A 10-foot long remote controlled flying Santa makes a test flight over the ocean in Carlsbad, California, U.S., December 3, 2017. REUTERS/Mike Blake TPX IMAGES OF THE DAY

A 10-foot long remote controlled flying Santa makes a test flight over the ocean in Carlsbad, California, U.S., December 3, 2017. REUTERS/Mike Blake

A 10-foot long remote controlled flying Santa makes a test flight past a setting moon over the ocean in Carlsbad, California, U.S., December 3, 2017. REUTERS/Mike Blake

A dog dressed in Santa Claus costume take part in the Santa Claus Run in Budapest, Hungary, December 3, 2017. REUTERS/Laszlo Balogh

A booth selling gingerbread hearts is seen at a Christmas market in Dortmund, Germany, November 30, 2017. REUTERS/Leon Kuegeler

A Christmas tree is seen in a Christmas tree field at Wick Farm in Colchester, Britain, November 29, 2017. REUTERS/Hannah McKay

A worker carries a freshly harvested Christmas tree at Wick Farm in Colchester, Britain, November 29, 2017. REUTERS/Hannah McKay