1. The Question of Musaf When Crossing the International Date Line
This discussion, based on Shulchan Menachem chapter 324, addresses a unique scenario relevant during Sukkot and other occasions: What should one do when flying and crossing the international date line? Specifically, how does this affect the Musaf—the additional prayer—when it comes to reciting the verses for the day's sacrifices?
The issue arises because, in Musaf during Sukkot, we specify the particular sacrifices (karbanos) brought on each day. When crossing the international date line, a person effectively skips a day or repeats a day depending on the direction of travel. This leads to confusion about which day's verses should be recited in Musaf.
2. Understanding the Impact of Time Zones and Date Line
Traveling from Israel does not involve crossing the international date line, but one does pass through multiple time zones. However, simply changing time zones is not equivalent to skipping or repeating a day as happens when crossing the date line itself.
The core question is whether crossing this imaginary line truly changes one's halachic day for purposes such as prayer. The international date line is a human construct for civil purposes; its halachic significance is debated. Does it actually impact which day's karbanos are mentioned in Musaf? Or does one only change their observance upon arriving in a settled community where that day is being kept?
3. Practical Scenarios: In Flight Versus Arrival
If someone travels to Australia, for example, and arrives in a place where it is already a day ahead, then upon arrival they follow the local observance and recite prayers according to that day's requirements. However, while still on the airplane and in transit over the date line, it is unclear whether one should immediately switch to reciting prayers for the new day.
The question becomes especially pressing when considering that in Ashkenazic practice (as reflected in our Siddur), we specify exactly which day's karbanos are brought. This specificity creates confusion when one's location relative to the date line is ambiguous.
4. The Problem with Doubling Prayers and Ashkenazic Practice
One might suggest resolving doubt by reciting two versions of Musaf, each with different day's verses—similar to how two Shacharit prayers might be said under certain circumstances. However, this solution is not viable: Halacha does not allow two Musafs to be recited on one day.
Thus, Ashkenazim face a dilemma: their liturgy requires specifying the day's sacrifices, but uncertainty about which day it truly is (due to crossing the date line) leaves them without clear guidance.
5. The Sefardic Approach and Possible Solutions
Sefardim avoid this problem because their Siddur simply states "Kakasu b'serasecha—as written in Your Torah," without specifying each day's unique verses for the sacrifices. Therefore, there is less risk of error or doubt when praying while traveling across uncertain boundaries.
One possible solution suggested is that Ashkenazim could adopt this Sefardic formula when faced with such doubt: instead of specifying that day's karbanos, simply say "as written in Your Torah" to avoid making an incorrect declaration.
6. The Rebbe’s Perspective and Unresolved Doubt
The Rebbe notes this suggestion but questions whether it is appropriate for Ashkenazim who are otherwise obligated by their custom to specify each day's sacrifices. If one has already begun davening according to Ashkenazic practice, can they suddenly switch approaches due to uncertainty?
Ultimately, the Rebbe does not resolve this question definitively but highlights that there remains an unresolved issue regarding what should be done in such cases of doubt when crossing the international date line during Sukkot or similar situations.
This shiur discusses the halachic question of which Musaf prayer to recite when crossing the international date line, especially during Sukkot. The issue centers on specifying the day's sacrifices in Musaf and how this is affected by skipping or repeating a day due to travel.
It explains that traveling through time zones does not equate to crossing the date line, which uniquely changes one's halachic day. The shiur explores whether this civil boundary has true halachic impact for prayers like Musaf, or if observance only changes upon arriving in a settled community.
Practical examples are given: upon arrival in a new place (like Australia), one follows local observance. However, while still in flight over the date line, it is unclear if one should immediately switch prayers. This is complicated for Ashkenazim, whose Siddur specifies each day's sacrifices.
The shiur notes that saying two versions of Musaf is not allowed according to Halacha, leaving Ashkenazim with a dilemma when uncertain about the correct day due to crossing the date line.
Sefardim avoid this problem by using a general formula in their Siddur. The shiur suggests Ashkenazim could use this approach when in doubt—reciting "as written in Your Torah" instead of specifying—but questions remain about changing established custom mid-prayer.
The Rebbe acknowledges this suggestion but does not provide a definitive resolution, highlighting that uncertainty remains for Ashkenazim who cross the international date line during Sukkot or similar occasions.
Summary
This shiur highlights the complexity of halachic observance when traveling across time boundaries and underscores the importance of clarity and consistency in prayer customs, especially during unique situations like crossing the international date line on Sukkot.