Museum looks great but I am really admiring your laptop and hotel room! LOL!  The children look so BEAUTIFUL in their matching Jammie’s and breakfast looks pretty good too!

ryc. Sorry, Sarah,   I know it can be confusing, this article should help to answer your questions. The  Russian and the Greek Orthodox faith are the same Christian faith,  the practices/traditions do vary but not the doctrine, creed, theology, dogma etc…Orthodoxy is Orthodoxy, the theology does not change, the theology has remained the same from the first church councils. Here is an article about The History of The Orthodox Church.  The Russians adopted the Orthodox Christian faith from Greek missionaries.

Here is a bit from the second article-

The Conversion of the Slavs

This evangelization, or christianization, of the Slavs was initiated by one of Byzantium’s most learned churchmen – the Patriarch Photius. His choice of the brothers Cyril and Methodius for the mission was a stroke of genius and missionary insight, for both spoke the Slavic dialect then in use among the Slavic settlers near their native city of Thessalonica. Having received their commission, they immediately set about creating an alphabet, the so-called Cyrillic; they then translated the Scripture and the liturgy. Hence, the origins of Church Slavonic, the common liturgical language still used by the Russian Orthodox Church and other Slavic Orthodox Christians. Although their first mission to Moravia was unsuccessful (they were forced to flee by German missionaries and the changing political situation), their work was not in vain. Before long Byzantine missionaries, including the exiled disciples of the two brothers, turned to other areas. Bythe beginning of the eleventh century most of the pagan Slavic world, including Russia, Bulgaria and Serbia, had been won for Byzantine Christianity. Bulgaria was officially recognized as a patriarchate by Constantinople in 945, Serbia in 1346, and Russia in 1589. All these nations, however, had been converted long before these dates. The conversion of Russia actually began with the baptism of Vladimir of Kiev in 989, on which occasion he was also married to the Byzantine princess Anna, the sister of the Byzantine Emperor Basil II.

Here is a bit from the first article that will answer the calender questions.

1. Religious Calendar: History and Development

Within the Orthodox Church feast days and fast days are reckoned according to two distinct calendars, the Julian Calendar and the Gregorian Calendar. The first is attributed to the Roman Emperor Julius Caesar, whose name it bears. It was later corrected in the sixteenth century by Pope Gregory XIII due to the ever-increasing discrepancy between calendar time and calculated astronomical time. Thus the Gregorian Calendar came into being.

Old and New Calendars

Inasmuch as the Julian Calendar had been in continuous use in the Christian East and West throughout the centuries, the subsequent introduction of the Gregorian Calendar in the West created yet another anomaly in the deteriorating relations between the two Churches. The need for correction of the Julian Calendar was well understood in the East and had even led some to devise a new calendar themselves. Nevertheless, the Julian Calendar remained in use throughout the Byzantine period and beyond. Despite the efforts of the emissaries of Pope Gregory to convince the Orthodox to accept the New (Gregorian) Calendar, the Orthodox Church rejected it. The main reason for its rejection was that the celebration of Easter would be altered: contrary to the injunctions of canon 7 of the Holy Apostles, the decree of the First Ecumenical Synod, and canon 1 of Ancyra, Easter would sometimes coincide with the Jewish Passover in the Gregorian calendar.

This is where the matter stood until the end of World War I. Until then, all Orthodox Churches had strictly abided by the Old (Julian) Calendar, which at present is 13 days behind the New Calendar long since adopted by the rest of Christendom. In May of 1923, however, an “Inter-Orthodox Congress” was convened at Constantinople by the then Ecumenical Patriarch, Meletios IV. Not all Orthodox Churches were in attendance. The Churches of Serbia, Romania, Greece, and Cyprus were; the Churches of Alexandria, Antioch and Jerusalem, although invited, were not; the Church of Bulgaria was not invited. Several issues were under discussion at the congress, one of which was the adoption of the New Calendar. No unanimous agreement was reached on any of the issues discussed. Several of the Orthodox Churches, however, did eventually agree, though not all at the same time, to adopt the New Calendar. These were the Churches of Constantinople, Alexandria, Antioch, Greece, Cyprus, Romania, Poland, and most recently, Bulgaria (1968); on the other hand, the Churches of Jerusalem, Russia and Serbia, along with the monasteries on Mt. Athos, all continue to adhere to the Old Calendar.

2. Calendar Problems and Implications Among the Orthodox Churches in the Twentieth Century
The Old Calendarists

The result of this situation is unfortunate indeed. The Orthodox Churches which have adopted the New Calendar observe Christmas with the other Churches of Christendom on December 25; the Orthodox Churches which have not adopted it celebrate Christmas 13 days later, on January 7. The former celebrates Epiphany on January 6 and by the latter on January 19. And so it is with all the great feasts of the Christian Calendar but one. Easter, the feast of feasts, continues to be calculated by all Orthodox Churches to the dates of the Old Calendar. Consequently, all Orthodox Churches observe the event of Christ’s Resurrection on the same day, regardless of when the rest of Christendom does. An exception to this general rule is the Orthodox Church of Finland. Owing to the fact that it makes up less than 2 per cent of the population of a predominantly Lutheran country, it observes Easter according to the New Calendar for practical reasons.

It may well be that the date of Orthodox Easter occasionally coincides with that of the other Christian Churches; however, it may also occur as much as 5 weeks later. Thus arose the formula applied by the Orthodox Churches adopting the New Calendar–viz., that immovable feast days are to be observed 13 days earlier than in the Old Calendar, while Easter and all movable feast days dependent on it are still calculated according to the Old Calendar–which was seen as a compromise with those who opposed the change. On the one hand, the necessary revisions were made to correct the Old Calendar; on the other hand, the calculation of Easter was retained as before so as not to violate the holy canons. Nevertheless, this compromise was to prove incapable of preventing the schism of “Old Calendarists” which ensued.

As is always the case with reform movements, there was strong opposition to the adoption of the New Calendar, especially in Greece. What differed in this situation, however, was that reform was initiated by the established Church together with the total backing of the state. Groups of “Old Calendarists” or Palaioemerologitai, refused to abide by the Church’s decision and continued to follow the Old Calendar for both movable and immovable feast days. The basis of their refusal to abandon the Old Calendar rested on the argument that canons ratified by an Ecumenical Synod knew only of the Julian Calendar. Therefore, nothing less than an Ecumenical Synod had the authority to institute a reform of such proportion. In view of their refusal to submit to the authority of the Church of Greece, the official Church excommunicated them. This was not the case with the monasteries of Mt. Athos. Although all but one (i.e., 19 monasteries) continued to follow the Old Calendar, they are under the jurisdiction of the Patriarchate of Constantinople with which they continue to be in communion. Despite attempts by the civil authorities in Greece to suppress them, the “Old Calendarists” continue to exist there and abroad and to maintain a hierarchy of their own together with parishes and monasteries.

6. Orthodox Easter

The determination of the date of Easter is governed by a computation based on the vernal equinox and the phase of the moon. According to the ruling of the First Ecumenical Synod in 325, Easter Sunday should fall on the Sunday which follows the first full moon after the vernal equinox. If the full moon happens to fall on a Sunday, Easter is observed the following Sunday. The day taken to be the invariable date of the vernal equinox is March 21.

Herein lies the first difference in the determination of Easter between the Orthodox Church and the other Christian Churches. The Orthodox Church continues to base its calculations for the date of Easter on the Julian Calendar, which was in use at the time of the First Ecumenical Synod. As such, it does not take into consideration the number of days which have since then accrued due to the progressive inaccuracy of the Julian Calendar. Practically speaking, this means that Easter may not be celebrated before April 3 (Gregorian), which had been March 21–the date of the vernal equinox–at the time of the First Ecumenical Synod. In other words, a difference of 13 days exists between the accepted date for the vernal equinox then and now. In the West, this discrepancy was addressed in the 16th century through the adoption of the Gregorian Calendar, which adjusted the Julian Calendar still in use by all Christians at that time. Western Christians, therefore, observe the date of the vernal equinox on March 21 according to the Gregorian Calendar.

The other difference in the determination of Easter between the Orthodox and other Christian Churches concerns the date of Passover. Jews originally celebrated Passover on the first full moon following the vernal equinox. Christians, therefore, celebrated Easter on the first Sunday after the first full moon following the vernal equinox. After the destruction of Jerusalem in 70 A.D. and the other tragic events, which gave rise to the dispersal of the Jews, Passover sometimes preceded the vernal equinox. This was occasioned by the dependence of the dispersed Jews upon local pagan calendars for the calculation of Passover. As a consequence, most Christians eventually ceased to regulate the observance of Easter by the Jewish Passover. Their purpose, of course, was to preserve the original practice of celebrating Easter following the vernal equinox.

As an alternative to calculating Easter by the Passover, “paschal (Easter) cycles” were devised. The Orthodox Church eventually adopted a 19-year cycle, the Western Church an 84-year cycle. The use of two different “paschal cycles” inevitably gave way to differences between the Eastern and Western Churches regarding the observance of Easter. Varying dates for the vernal equinox increased these differences. Consequently, it is the combination of these variables, which accounts for the different date of Orthodox Easter, whenever it varies from the rest of Christendom.