The Torah's Twilight Zone

A fascinating theory that totally turns the concept of how day and night work in Judaism has been proposed by Rav Yaakov Kaminetsky zt"l in his commentary to this week's parsha. The Torah states that one is forbidden to leave over meat from his korbon pesach. All meat must be eaten prior to dawn. (Shemos 12:10) Rashi informs us that one would have thought that the prohibition was not to leave over meat till after sunrise, but the wording in this pasuk teaches that the time period is dawn and not sunrise (dawn is the twilight period prior in which there is light, but the sun is not visible above the horizon).

Rav Kaminetsky ponders why one would have thought that the time period discussed is sunrise. Regarding all other Torah matters dawn is considered to be the beginning of day. Why is it that in this specific instance that sunrise would have been more applicable had the Torah not specified that this mitzvah is similar to the rest?

Firstly, Rav Kaminetsky suggests that prior to Matan Torah day preceded night (this is also the opinion of the Rashbam in Bereishis on the pasuk of there being evening and morning for the cessation of a day of creation) and he cites many instances where this is clearly expressed. Regarding korbonos, day also appears to precede night as most korbonos are able to be eaten on the day they are slaughtered and the following night (with the exception of a shelamim). Also, the limbs of the korbonos were processed on the mizbeach throughout the night the follows their slaughtering. (Although, see Tosefos Menachos 49a - 49b who seem to have a different understanding)

Secondly, even after Matan Torah day is normally defined as when the sun is above the horizon and night is when it is below and twilight is night (even for non-kodshim mitzvos). The doubt of when night begins that is referred to as bein hashmashos is not a doubt of when day becomes night, rather, it is when the date changes (there is no bein hashmashos in the morning twilight in the post-Matan Torah world). This doubt is going to occur at the time period when the date should be changing, so prior to Matan Torah this occurred in the morning and after Matan Torah it happens in the evening. This means that, nowadays, at sundown on Friday it is night. However, we are uncertain if it is Friday night and it has not become Shabbos, or if this time period is attributed to Shabbos and it is the night of Shabbos. The day has become night, but we don't know whether it has become the next date.

Therefore, prior to Matan Torah, and referring to kodshim, one could have thought that the prohibition of leaving over meat would be from sunrise because that is when it would certainly be the next day. Since the date change happens in the morning, there is an amount of time that would have been bein hashmashos (prior to Matan Torah and for kodshim). The Torah, therefore, clarified that this prohibition starts from the earliest possible time to be called the next morning and that is dawn and not sunrise. Effectively making no bein hashmoshos for kodshim ever (see Rambam regarding leaving over meat from a shelamim as he seems to support this theory; also see my Tiferes Aryeh Zevachim chapter 32, available at www.hebrewbooks.org/36567, regarding if one needs to wait on the first night of Pesach to make kiddush).

This general concept is also discussed at great length by Rav Yitzchak Isaac Chaver zt"l in his Seder Zemanim, although he attributes the twilight period to daytime and not night.

Mincha 3 Minutes After Chatzos?

Now that the clocks have changed, many are finding themselves able to daven mincha at very early (and often times convenient times.) Couple that with the fact that we find Yitzchak Avinu davening mincha in this week's parsha and it makes for a great topic. Many are familiar with the common halachic practice of waiting 1/2 hour (defined as a 1/24 of the time between sunrise and sunset or 30 minutes, whichever is longer) from midday to daven. Upon further analysis, one must ask why one cannot daven much earlier (say 3 minutes after midday) during many times of the year.

The reason for this practice is as follows. The Gemara (Yoma 28b) tells us that they delayed from davening mincha (or bringing the afternoon offering in the Beis HaMikdash) until they could be certain that it was after midday. Since the walls in the Beis HaMikdash were sloped, it took 1/2 hour after midday for them to cast a noticeable shadow. Therefore, we wait this amount of time (the Mishna Berurah in his Shaar HaTziyun 233:8 is unsure if this half hour is 1/24 of the day or 30 minutes and this is why many take the longer of the two; athough ALL the earlier sources maintained it was 1/24 of the day).

We must identify upon which day we are talking regarding the shadow from the walls. The sun always "travels" at the same speed. However, during some days the sun is going in more of an east/west motion and others it is going more up/down. In the summer when the days are long, the sun is not taking a steep angle at midday and most of its motion is seen going east/west. During the winter, the sun is going at a steep angle because the day is short and it is starting to go downwards quickly. The sun will therefore cast the same amount of shadow in the summertime at a far shorter time interval than the winter.

The Gemara tells us that the day we are talking about is when Erev Pesach falls on Erev Shabbos. On such a day, the afternoon offering would be brought a half hour after midday, as opposed to a normal day when it would be brought three and a half hours after midday. Since Pesach is around the time of the vernal (spring) equinox, one can now figure the time required for the shadows throughout the rest of the year.

In the summertime, it would only take 9 minutes for the sun to travel from midday in a westward direction to reach the same point. In the winter it would take 50 minutes. This does not take into account the fact that the sun is higher in the summer than winter. That would make the times more extreme. If one goes to a latitude higher than Yerushalayim, that will also shorten the amount of time necessary to cast the shadow.

All this can be seen via a simple experiment. Take something like a book and lean it against a wall. Then take a flashlight and move it from one side to the next and watch how quickly the shadow is cast. Notice that if the "across" motion is done more quickly the shadow is cast faster. Also, notice that if the flashlight is held higher the shadow is cast sooner.

Could this mean that here in Baltimore we could daven mincha in the summer at 3 minutes after midday? The answer would most certainly be "no." A reading of the Rambam (Hilchos Tefillah 3:2) makes it clear that we are not mimicking what could be happening in the Beis HaMikdash if it were in your location and on the day you are davening. We are calculating the concept of the time based on the Beis HaMikdash and utilize when they would bring the sacrifices. Since the only day this offering was offered so closely to midday was around the vernal equinox we only take that day as a reference point. Therefore, even though the shadow would be cast much sooner in the wintertime and in Baltimore, we don't care. It must also be noted that one should preferably not daven prior to 3 1/2 hours after midday unless there is a pressing need. This is seen in the Shulchan Aruch and comes about from the fact that they only offered the sacrifice earlier in the Beis HaMikdash when there was a pressing need.

Davening at Neitz is Sometimes Just WRONG

The early bird may get the worm, but the late worm gets to live!!! Being early doesn't always mean better. While it is certainly true that one who davens right at neitz (sunrise, more properly called haNeitz) is doing something noble, one who davens right as he sees the sun rising may actual be worse off than someone who slept late. This is especially true this time of the year!

No, I am not talking about the silliness of having atomic clocks at a neitz minyan. While it is true that by davening at the exact time of listed sunrise (no matter how precise to the location one has calculated it for) is the most statistically improbable time for actual visible sunrise (based on barometric pressure and other weather disturbances), that is not what I am talking about. I am talking about someone who goes out and davens at the first visible sign of sunrise; the way it was done back in the times of the Gemara.

There is a phenomenon known as the Novaya Zemlya effect. Back in 1596 Willem Barentsz, the famous explorer, was sailing through the Arctic in search of a northeast passage. His unlucky crew got stuck in Novaya Zemlya (just north of Siberia), and had to stay there through the winter. As is the case above the Arctic Circle, the sun does not rise for a portion of the winter. The eager crew waited for sunrise and were anxious to be able to leave this frozen tundra.

Then in January of 1597 one of the crewmembers, Gerrit de Veer saw the sun peaking above the horizon. The fantastic thing about this was that this was TWO WEEKS before it was supposed to happen. Gerrit was the first person to record in writing what has now become known as the Novaya Zemlya effect.

The basic concept is that when there is a duration of warm weather immediately after a cold spell a mirage can appear on the horizon. This happens most often in spring and fall as the temperatures fluctuate a lot. The warm air creates a current near the horizon. It can be focussed right near the spot where the sun will rise (that is a warmer area). This current then acts as a lens and refracts the image of the sun from below the horizon to above it. Meaning, the sun looks like it rose even though it is really below the horizon. This sunrise often looks a little distorted, but someone with no knowledge of the effect would just think he was seeing a sunrise in a hazy patch in the sky.

While it seems clear that we take into account weather disturbances when calculating neitz, these are only the ones that are realtively small. Things like small weather disturbances and barometric pressure can affect visible sunrise and it seems that in the times of teh Gemara they based sunrise on visiblity. However, these only change sunrise by small amounts. The Novaya Zemlya effect can be very pronounced! So, before you get upset that you woke up early for nothing, make sure you know the difference between true and fake sunrise!!!

Another VERY VERY important fact that de Veer recorded. In fact, this one can even be life threatening!!! Eating polar bear livers can cause hypervitaminosis and can be fatal!!!