
There are several differences between the Orthodox and Catholic churches, including the way they celebrate Christmas. While both denominations celebrate the birth of Jesus Christ, they do so according to different calendars, resulting in different dates. The Catholic Church, along with most of the secular world, uses the Gregorian calendar, which marks 25 December as Christmas Day. In contrast, many Orthodox churches follow the Julian calendar, which is about 13 days out of alignment with the Gregorian calendar, resulting in Christmas falling on 6 or 7 January. However, some Orthodox churches, such as the Ukrainian Orthodox Church, have adopted the Gregorian calendar and now celebrate Christmas on 25 December.
| Characteristics | Values |
|---|---|
| Date of Christmas celebration | Orthodox Christians celebrate Christmas on 6, 7, or 8 January, while Catholics celebrate on 25 December. However, some Orthodox churches have adopted the Gregorian Calendar and observe Christmas on 25 December. |
| Calendar used | Orthodox Christians generally follow the Julian Calendar, while Catholics use the Gregorian Calendar. |
| Reason for date difference | The Julian Calendar was introduced in 1923 and is a modified version of the older Julian Calendar, which had become astronomically inaccurate. The Gregorian Calendar was introduced by Pope Gregory in 1582 to standardize Christian holidays and eliminate the lag between the two calendars. |
| Christmas Eve traditions | On Christmas Eve, Orthodox Christians in the Western Balkans bring a section of an oak tree called "badnjak" home and set it on fire. In Ukraine, there are "vertep" puppet theatre street performances based on the nativity, accompanied by singing and dancing. |
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What You'll Learn
- The Julian calendar is used by most Orthodox Christians, causing a 13-day lag
- The Gregorian calendar, introduced by Pope Gregory in 1582, is used by Catholics
- Orthodox Christians celebrate Christmas on 6/7 January, while Catholics celebrate on 25 December
- Some Orthodox churches have adopted the Gregorian calendar and observe Christmas on 25 December
- The Ukrainian Orthodox Church has allowed its believers to celebrate Christmas on 25 December

The Julian calendar is used by most Orthodox Christians, causing a 13-day lag
The date of Christmas is a divisive topic among Christians, with the Catholic Church and most Orthodox churches celebrating the holiday on different dates. While the majority of Christians, including Catholics, celebrate Christmas on December 25, some Orthodox churches observe Christmas on January 7 or 6, depending on the region. This discrepancy is due to the differing calendars used by the two denominations.
The Julian calendar, introduced in 1923 by Serbian astronomer Milutin Milanković, is used by most Orthodox Christians. This calendar is based on an older system that was found to be astronomically inaccurate due to miscalculations of the length of the year. As a result, the Julian calendar falls about 13 days behind the Gregorian calendar, which is used by Catholics and most of the secular world.
The Gregorian calendar was introduced by Pope Gregory XIII in 1582 to standardize Christian holidays and correct the inaccuracies in the Julian calendar. By the 16th century, the lag between the Julian calendar and the actual solar year had reached 10 days. The Gregorian calendar eliminated this discrepancy, establishing December 25 as the date of Jesus Christ's birth.
Despite the widespread adoption of the Gregorian calendar, some Orthodox churches, including the Russian Orthodox Church, continue to adhere to the Julian calendar. They view themselves as defenders of tradition and resist changing the way they calculate the date of Christmas. This stance has caused a 13-day lag in their celebration of Christmas compared to the Catholic Church and other Orthodox churches that have adopted the Gregorian calendar.
However, it is important to note that not all Orthodox churches strictly follow the Julian calendar. In recent years, there has been a push for unity, with some Orthodox churches, such as the Orthodox Church of Ukraine, allowing their believers to celebrate Christmas on December 25, together with the rest of the Western world.
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The Gregorian calendar, introduced by Pope Gregory in 1582, is used by Catholics
The Catholic Church and many Protestant denominations use the Gregorian calendar, introduced by Pope Gregory XIII in 1582, to celebrate Christmas on December 25. This calendar was introduced to standardize Christian holidays and correct the miscalculations of the Julian calendar, which was introduced in 45 BCE by Julius Caesar. The Julian calendar had a slight miscalculation, causing it to fall out of sync with the solar year, resulting in a 13-day difference by the 16th century.
The Gregorian calendar is named after Pope Gregory XIII, who introduced it in October 1582. It was designed to replace the Julian calendar, which had been in use for over 1,500 years. The Gregorian calendar is a solar calendar with 365 days in a common year and 366 days in a leap year. The calendar year starts on January 1 and is divided into 12 months of irregular lengths. The Gregorian calendar is the world's most widely used civil calendar, adopted officially by many Catholic and Protestant countries in the years following its introduction.
The Gregorian calendar was designed to address two issues with the Julian calendar. Firstly, it aimed to standardize the calculation of the Christian holidays of Easter and Christmas. Secondly, it corrected the Julian calendar's overestimation of the average calendar year, bringing it closer to the actual solar year length. The Gregorian calendar achieved this by skipping three days so that the winter solstice fell on December 21, and by introducing a rule for leap years that would slow down the calendar by three days every 400 years.
The adoption of the Gregorian calendar by Catholics and many Protestants resulted in a divergence from the Orthodox churches, who largely continued to use the Julian calendar. This divergence led to a difference in the dates of religious celebrations, including Christmas. While Catholics and many Protestants celebrate Christmas on December 25 according to the Gregorian calendar, many Orthodox churches, including the Russian Orthodox Church, celebrate Christmas on January 7 according to the Julian calendar.
However, it is important to note that not all Orthodox churches adhere strictly to the Julian calendar. Some Orthodox churches, such as the Orthodox Church of Ukraine, have allowed their believers to celebrate Christmas on December 25, aligning with the Catholic and Protestant traditions. Additionally, the New Julian calendar, proposed in 1923, is a modified version of the Julian calendar that aims to align with the Gregorian calendar. By the year 2800, the New Julian calendar will completely coincide with the Gregorian calendar.
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Orthodox Christians celebrate Christmas on 6/7 January, while Catholics celebrate on 25 December
The difference in celebration dates between Orthodox Christians and Catholics is due to the separate calendars they use to mark the birth of Jesus Christ. Orthodox Christians traditionally celebrate Christmas on the 6th and 7th of January, while Catholics and other denominations of Christianity celebrate on the 25th of December.
The Julian calendar, used by most Orthodox Christians, is about 13 days out of alignment with the widely-used Gregorian calendar, which was introduced by Pope Gregory XIII in 1582. This discrepancy causes the 13-day difference in Christmas celebrations. The Julian calendar was found to be astronomically inaccurate, with incorrect calculations of the length of the year, resulting in a ""lag" that has reached 13 days and will continue to grow.
However, it is important to note that not all Orthodox churches adhere strictly to the Julian calendar. Some have adopted the Gregorian calendar and observe Christmas on December 25, such as the Ukrainian Orthodox Church. On the other hand, the Russian Orthodox Church continues to uphold the traditional Julian calendar.
The date of Christmas celebrations is a point of contention within Orthodox Christianity, with some advocating for a unified date to promote intra-faith harmony. The discrepancy also has implications for other Christian celebrations, such as Easter, which is calculated based on the lunar calendar and can vary between the two calendar systems.
While Catholics and the majority of Christian denominations celebrate Christmas on December 25, it is worth noting that the specific date of Christ's birth is not definitively known. The final decision to commemorate his birth on December 25 was made in 431 at the Ephesus (Third Universal) Church Council.
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Some Orthodox churches have adopted the Gregorian calendar and observe Christmas on 25 December
The date of Christmas is determined by the calendar that different Orthodox churches follow. Most Orthodox churches follow the Julian calendar, which has a 13-day lag behind the Gregorian calendar, causing Christmas to fall on 6 or 7 January. However, some Orthodox churches have adopted the Gregorian calendar, observing Christmas on 25 December, the same date as Catholic churches.
The Julian calendar was found to be astronomically inaccurate, with its calculations of the length of the year causing Christmas to move closer to the vernal equinox. This ""lag"" has now reached 13 days and will continue to grow, resulting in Christmas falling on 8 January by the year 2100.
In the 16th century, Pope Gregory XIII implemented calendar reform, introducing the Gregorian calendar that eliminated the lag behind the Julian calendar. Since then, the Roman Catholic and Protestant churches have celebrated Christmas on 25 December according to this calendar.
While the majority of Orthodox churches continue to use the Julian calendar, some have adopted the Gregorian calendar and observe Christmas on 25 December. For example, in 2022, a branch of Ukraine's Orthodox Church that had remained loyal to Moscow after the 2019 split announced it would celebrate Christmas on 25 December, together with most of the Western world. This decision was influenced by Ukraine's desire to establish its own independent Orthodox Church separate from Moscow, highlighting the ideological differences between the two countries' Orthodox churches.
The date of Christmas celebrations within the Orthodox Church is not only a matter of calendar preference but also carries theological and cultural implications. Some Orthodox churches, such as the Russian Orthodox Church, cling to the Julian calendar as a matter of tradition and theological difference from the Catholic Church, whose calendar was instituted by the Pope.
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The Ukrainian Orthodox Church has allowed its believers to celebrate Christmas on 25 December
Historically, the Ukrainian Orthodox Church has been affiliated with the Russian Orthodox Church, following the Julian calendar and celebrating Christmas on 7 January. However, in October 2022, the Orthodox Church of Ukraine (OCU) took steps towards autonomy by allowing dioceses to hold Christmas services according to the Revised Julian calendar, resulting in the change of the Christmas date to 25 December. This change was formalised in May 2023, when the OCU officially declared 25 December as the permanent date for Christmas commemorations.
This decision has been met with enthusiasm by many Ukrainians, who see it as a move towards unity and a break from imperial remnants. In 2023, Ukraine celebrated its first Christmas on 25 December, with President Volodymyr Zelenskyy emphasising the importance of the nation celebrating together "as one big family, as one nation, as one united country".
The change in the date of Christmas celebrations in Ukraine also has implications for the unity of the Orthodox Church. While some parishes have embraced the new date, others continue to follow the traditional Julian calendar, creating a division within the religious community. Nonetheless, the head of the OCU, Metropolitan Epiphanius, has emphasised that this issue should overcome church divisions and that the transition to a new date should be initiated by the laity.
In conclusion, the Ukrainian Orthodox Church's decision to allow its believers to celebrate Christmas on 25 December carries both religious and cultural significance. It represents a step towards autonomy from Russian influence, fosters unity among Ukrainians, and highlights the ongoing evolution of religious practices within the country.
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Frequently asked questions
No, they are not the same. Orthodox Christmas is celebrated on the 7th of January, while Catholic Christmas is celebrated on the 25th of December.
Orthodox Christians follow the Julian calendar, which was introduced in the 4th century AD. The Julian calendar is 13 days ahead of the Gregorian calendar, which is followed by Catholics and most of the secular world.
The Gregorian calendar was introduced by Pope Gregory in 1582 to standardize Christian holidays and correct the miscalculations of the Julian calendar, which caused Christmas to move closer to the vernal equinox.
No, while many Orthodox Christians celebrate Christmas on January 7th, some have adopted the Gregorian calendar and observe Christmas on December 25th. For example, in 2022, the Orthodox Church of Ukraine allowed its believers to celebrate Christmas on December 25th.
While the dates of celebration differ, the day itself is the same for both Catholics and Orthodox Christians. In addition, some Orthodox Christians with non-Orthodox family members choose to celebrate Christmas with their families on December 25th and then again with their church on January 7th.


























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