Landscapes Portraying January. January is the first month of the year in the Julian and Gregorian calendars and the first of seven months to have a length of 31 days. The first day of the month is known as New Year's Day. It is, on average, the coldest month of the year within most of the Northern Hemisphere and the warmest month of the year within most of the Southern Hemisphere. In the Southern hemisphere, January is the seasonal equivalent of July in the Northern hemisphere and vice versa. Ancient Roman observances during this month include Cervula and Juvenalia, celebrated January 1, as well as one of three Agonalia, celebrated January 9, and Carmentalia, celebrated January 11. These dates do not correspond to the modern Gregorian calendar. January is named after Janus, the god of beginnings and transitions in Roman mythology. Traditionally, the original Roman calendar consisted of 10 months totaling 304 days, winter being considered a month-less period. Around 713 BC, the semi-mythical successor of Romulus, King Numa Pompilius, is supposed to have added the months of January and February, so that the calendar covered a standard lunar year. Although March was originally the first month in the old Roman calendar, January became the first month of the calendar year either under Numa or under the Decemvirs about 450 BC. In contrast, each specific calendar year was identified by the names of the two consuls, who entered office on May 1 or March 15 until 153 BC, from when they entered office on January 1. Various Christian feast dates were used for the New Year in Europe during the Middle Ages, including March 25 and December 25. However, medieval calendars were still displayed in the Roman fashion with twelve columns from January to December. Beginning in the 16th century, European countries began officially making January 1 the start of the New Year once again, sometimes called Circumcision Style because this was the date of the Feast of the Circumcision, being the seventh day after December 25. Historical names for January include its original Roman designation, Ianuarius, the Saxon term Wulf-monath and Charlemagne's designation Wintarmanoth. In Slovene, it is traditionally called prosinec. The name, associated with millet bread and the act of asking for something, was first written in 1466 in the Škofja Loka manuscript. According to Theodor Mommsen, 1 January became the first day of the year in 600 AUC of the Roman calendar, due to disasters in the Lusitanian War. A Lusitanian chief called Punicus invaded the Roman territory, defeated two Roman governors, and killed their troops. The Romans resolved to send a consul to Hispania, and in order to accelerate the dispatch of aid, they even made the new consuls enter into office two months and a half before the legal time. January's birthstone is the garnet, which represents constancy. Its birth flower is the cottage pink Dianthus caryophyllus or galanthus. The Japanese floral emblem of January is the camellia. In Finnish, the month of tammikuu means the heart of the winter and because the name literally means oak moon, it can be inferred that the oak tree is the heart of the grand forest with many valuable trees as opposed to the typical Arctic forests, which are typically pine and spruce. The photograph of a large tree covered with ice against a blue sky is a familiar scene during Finland's winter. The zodiac signs for the month of January are Capricorn and Aquarius.