Goofy title aside, this is actually a question for serious consideration. Namely the question of what should the shape of Christian piety take as humans begin to step out into the broader universe that our Lord has made for us. There will come a time when the vast majority of mankind will make its home among the stars, on various different worlds, and not on our beloved Earth. As we will see, several questions come up that make for interesting consideration.
For starters, it is highly unlikely that we would ever find a planet exactly the same as the Earth in terms of the cadence of time (much less environment). Certainly in the short term humanity is likely only to make permanent settlement on Mars, so lets take that as an example. Mars has a day that is a little longer than the Earth’s, so that is not much trouble to deal with. Its year, though, is significantly longer at 687 days (669 sols (Martian Days)). This means a Martian year is 1.88 Earth years. How do you deal with the Church Year in this environment?
There are two obvious solutions. The first would be to lengthen the Church Year to match the Martian year. This has the advantage of matching the Church Year to the natural cadence of those who will be Mars natives (actual legitimate Martians). Those Martians will never grasp the cadence of the Earth year for they do not live it and their seasons will differ substantially from ours here on Earth. The natural downside to this is that for millennia now the Church has celebrated contemporaneously the Church Year, disagreements about the date of Easter notwithstanding. Thus this divorcing from this practice of millennia will impact the catholic confession of faith which is the same in time and place, and planet.
The second solution is likely the better one, keep the Church Year fixed to the Earth calendar. After all we already do this for those in the southern hemisphere here on Earth, namely we do not change when Easter or Christmas are to fit the natural season, so we have prior practice. This also has the benefit of solving a tricky question: When is Easter? Unlike Christmas, Easter is a mobile holiday that moves depending on when Passover is. However Passover is tied to the Jewish Lunar Year. What does the Jewish Lunar Year mean when you are on a planet with two moons that orbit in 7 hours and 30 hours respectively? Even worse what if you are on a planet with out a moon, or are living on a moon of a larger planet, or on a space colony. The cadences of celestial bodies that seem so natural to us here on Earth become meaningless to those on other planets.
This practice also has benefit of confessing that the planet Earth has a unique theological position in the cosmos. It is on the Earth on which God first made humanity. It is the planet on which Christ did His atoning work. It is the world on which the Holy Spirit first descended on man at Pentecost. For these reasons, and a host of others, that the natural rhythms of Earth should hold a special significance for the Christian. Not that we are Gaia worshipers, but rather that structuring our theological lives around that rhythm of the Earth solves many problems for Christian piety. For instance what do we do with Psalms that explicitly mention the Earth or the world? What do we do with hymns that do so? In some places they are explicit references to our lovely home world, in others it is short hand for the entire cosmos. Certainly we would not want our future brothers and sisters on other planets to feel that they were not saved just because they were born and raised on other worlds (e.g. John 3:16). Thus already Christians will need to take a more nuanced view of Biblical and theological terms than we have had prior. It may even mean we have to adjust the language of our hymns to be more expansive, or alternatively (as we already do with hymns and psalms) understand the language in its context. Terms that say world and earth usually mean more than just our fair planet unless they very specifically tied to the planet Earth.
Anyways back to the topic of the Church Year. Frankly keeping the Church Year tied to the cadence of the Earth makes a lot of sense. Beyond that we have examples of other years that do not line up with the solar year here on Earth. We have fiscal years and school years. We have the example of the Islamic heathens who follow a moving lunar year because Mohammad claims it to be a sin to follow a solar year (see Sura 9:36-37). Even in Christianity the East and West keep slightly different calendars due to the debate over the date of Easter. Thus having an independent calendar, that is even divorced from the natural cadence of the world you are on, makes a lot of sense and is doable.
Of course there are a host of other interesting questions that come up with our expansion into space. How do Christians date things when other planets may have independent calendars tied to their natural cycles? How do we as Christians prevent ourselves from treating those who are born on Earth as privileged over those in on other worlds? How do we stem the tide of Gaia worship that is bound to crop up as we find more and more worlds that are desolate and lifeless showing the uniqueness of Earth? How do we deal with those of humanity that never took a Christian pastor with them and thus live on worlds that have never heard of Christ or of Earth because all knowledge of both has died away? Should we as a Church start prepping for the day when every colony ship will need a pastor or missionary to go with them to spread to word of Christ? All these questions may seem like science fiction now, but as history has shown questions of science fiction soon become science fact (see the discussions about what to do about the Native Americans when America was discovered). Contemplating them now will give us a leg up when our children or their children go off into the wide universe that our Lord has commanded us to fill and subdue.