The following is a short overview of the laws of Family Purity (Taharat Hamishpacha) and does not cover many crucial topics that an observant Jewish couple needs to know to keep these laws properly. If you would like to learn more about the laws of Family Purity please consider reading:
In-depth study with a qualified instructor and periodic review of all the laws of Taharat Hamishpacha remain essential. Every couple should carefully review the laws of Taharat Hamishpacha and the mikvah calendar (cheshbon calendar) at least once a year.
When a woman perceives or sees even a drop of blood discharged from her uterus, she is rendered nidah. All physical contact between husband and wife is forbidden during this time. Prior to resuming any physical contact with her husband, she is required to immerse in a kosher mikvah.
Please note that blood resulting from the breaking of the hymen (dam besulim) and from childbirth, while rendering the woman nidah, has no bearing on the calendar and will not affect any calculations, nor create any onot of anticipation.
Halacha (Jewish law) mandates the use of a Hebrew calendar to calculate the times required to abstain from marital relations in anticipation of a menstrual flow. The Hebrew date begins at shkiah (sunset) and ends the following day at shkiah (whereas the civil date, based on the standard solar calendar, begins and ends at midnight). All menstrual calculations are figured only according to the Hebrew calendar. Calculations based on any other calendar will not be accurate. Never use the standard solar calendar for this purpose although, for reference only, My Mikvah Calendar includes the civil dates.
An onah is a designated time frame. Each Hebrew calendar day is divided into two onot. The time between shkiah (sunset) and netz hachamah (sunrise) is known as the night onah, and the time between netz hachamah (sunrise) and shkiah (sunset) is known as the day onah. To simplify this concept, My Mikvah Calendar divides each day into two parts: the solid colored area on the left of each date box represents the night onah, and the lightly shaded area on the right of each date box represents the day onah. In order to accurately calculate your times of separation, it is important to correctly enter the onah (night or day) upon which your flow begins.
It is crucial to keep track of the exact times of sunset and sunrise for each day according to your location. This is very important since time determines which Hebrew date is to be counted as the date of the onset of the menstrual flow. It is also necessary to know exactly when a full five day count has been achieved so that the hefsek tahara may be attempted, and vital to determine which onah the period began so that the same onah will be observed as a time of separation. You can view these halachic times for your city here. They are also noted on each date of My Mikvah Calendar.
It is imperative to do these calculations yourself. My Mikvah Calendar can be used as a tool for learning how to keep a calendar, as well as double checking your results. This is because there are halachic opinions that maintain that the obligation to record the onot of separation can not be fulfilled by a computer. Our Print Calendar used in conjunction with My Mikvah Calendar satisfies all requirements.
In anticipation of the coming menstrual flow, halacha requires husband and wife to abstain from marital relations during all time frames that correspond to these three types of cycles. It is praiseworthy to be strict and refrain even from embracing and kissing, and even more so, from sharing the same bed at these times. The Alter Rebbe states in his Shulchan Aruch: "He who is stringent in this matter will be blessed." (A.R.S.A. chapter 184, note 6)
One should refrain from taking a bath or swimming on any onah of anticipation. Showering is permitted (so long as one does not wash internally). If one bathed before the required bedikah of an onah was performed, please consult your rav.
Each month you will anticipate your flow according to the same time and onah of the Hebrew date your menstrual flow began. If there is any staining preceding your period that you see but do not feel, although the Rav may determine it has made you nidah, for your calendar, day ONE of your flow is marked when the actual menstrual flow begins. If there is any staining preceding your period that you feel (any of the usual symptoms that tell you your period is coming) then that day is considered day ONE of your menstrual flow.
A filled in circle will appear on the same Hebrew date and onah the next month. The onah will be colored yellow. Solid color on the left side of the date box for a night onah, shaded yellow on the right side of the date box for a day onah.
Any Veset Hachodesh dates that are determined and recorded on your calendar are canceled once they are passed clean, i.e. free of any spotting or bleeding on that actual date (Rabbonei Chabad).
Some Chabad Rabbonim maintain that once a Veset Hachodesh date is determined, it is recorded and carried monthly unless you do not see any blood that renders you nidah on that onah of anticipation (Kitzur Dinei Taharah 8:13). Accordingly, dates may need to be carried over for one or more months. You may then have more than one date, colored yellow and marked with a circle indicating time/s of separation for the Veset Hachodesh, on your calendar in any given month. (Any dates previously marked as Veset Hachodesh dates from previous flows that fall within the line that appears as described below from the "P" to the "HT" would then be carried to the following month)
Other Chabad Rabbonim, including Rabbi Yekusiel Farkash in Tahara K’Halacha, maintain that any Veset Hachodesh dates of anticipation that fall within your actual flow are NOT carried and are then canceled from your calendar.* (Any dates previously marked as Veset Hachodesh dates from previous flows that fall within the line that appears as described below from the "P" to the "HT" would now be canceled and not carried to the following month)
If you are uncertain of which rabbinical determination to follow, please consult your rabbi.
*Note: According to all Chabad Rabbonim, including Rabbi Y. Farkash, there may still be months where there are more than one Veset Hachodesh dates on your calendar.
Example: New Flow #1 begins on the 1st of Elul. Veset HaChodesh is then the 1st of Tishrei. New Flow #2 begins on the 15th Elul.
Because the 1st of Tishrei was not yet passed by a clean bedikah, nor did it fall within the bleeding days of the new flow, there will be two Veset HaChodesh days for the month of Tishrei, the 1st of Tishrei and the 15th of Tishrei.
If your period began on the 30th day of the Hebrew month, lamed, and the following month there are only 29 days, the lamed is dropped with regard to the Veset HaChodesh.
Each couple must abstain from marital relations during the full designated onah (either night onah or day onah) of every Hebrew date colored yellow and marked on your calendar with a circle. It is praiseworthy to be strict and refrain even from embracing and kissing and even more so from sharing the same bed. The Alter Rebbe states in his Shulchan Aruch, “He who is stringent in this matter will be blessed.” (A.R.S.A. chapter 184, note 6)
Make a bedikah on each onah on which you anticipate a flow. Your bedikah should be made preferably just AFTER the time of day your flow began that created the Veset Hachodesh or sometime later on, but before the end of the onah. If the bedikah is clear or white, physical intimacy may resume only after the onah has ended. (p. 37 Kitzur Dinei Tahara)
Count four weeks and one day from the beginning of your last flow. Start the count with the day your last flow began. For example, if your flow started on either Sunday night (the night onah of Monday) or on Monday between sunrise and sunset, then four weeks later on Tuesday is the Onah Beinonit. It is exactly day 30 from your last flow (onset of flow being day 1).
A diamond will appear in the center of the box of the date of day 30. It will be colored yellow (both sides of the date box) and comprises two onot, night and day, as onot of anticipation and separation. The Onah Beinonit is a full 24 hour time of separation.
The Onah Beinonit is never carried over; it is calculated as the 30th day from each new flow.
Older Onah Beinonit dates are dropped from the calendar.
Each couple must abstain from marital relations for two full onot, (night and day) from shkiah to shkiah (24 hours) on the Hebrew date marked as day 30. It is praiseworthy to be strict and refrain even from embracing and kissing, and even more so from sharing the same bed. The Alter Rebbe states in his Shulchan Aruch, “He who is stringent in this matter will be blessed.” (A.R.S.A. chapter 184, note 6)
Make a bedikah before shkiah (suggested time is ten minutes prior to shkiah) at the end of the Onah Beinonit. If the bedikah is clear or white, physical intimacy may resume only after the Onah Beinonit has ended.
[For those women for whom making bedikot pose no difficulty, it is a chumrah (optional stringency) to make another bedikah after tzait hakochavim (nightfall) following the end of the Onah Beinonit. Tahara K'Halacha, by Rabbi Yekusiel Farkash.]
Please Note: A woman has a halachic obligation to inform her husband of the Onah Beinonit and to notify him that she has done the bedikah to cancel the day. If she does not inform him, it is the husband’s obligation to ask. If she forgot to make a bedikah, a Rav should be consulted.
Haflaga is the interval of onot between a successful hefsek tahara and the subsequent menstrual flow. The haflaga is customarily counted beginning with the night onah immediately following the hefsek tahara and terminating with the onah on which the following flow begins. Each date consists of two onot, a night onah followed by a day onah. You will have a count of two onot for each date, beginning with the date immediately following your successful hefsek tahara and ending your count with the onah upon which your flow begins.
Calculating by this method, the haflaga number is an odd number if the flow begins at night, and the separation will be during a night onah. The haflaga number is an even number if the flow begins during the day, and the separation will be during a day onah. The haflaga number can be calculated only once there is a successful hefsek tahara and then the onset of a subsequent period. The recording of the haflaga onah/ot onto the calendar, however, can only occur once the subsequent hefsek tahara has been successfully completed.
NOTE:
Some people compute the haflaga by counting the onot from the onah immediately following the hefsek taharah up to and including the onah immediately BEFORE the new flow. When figuring the haflaga onah/ot, they abstain on the onah that immediately follows the end of their count. This coincides with the haflagh onah designated by the method explained in the main text above. However, calculating by this alternative method will give an even number indicating separation during a night onah and an odd number indicates separation on a day onah. Regardless of how one calculates the haflaga, the onah of separation remains the same, only the number is different. Click here for instructions for entering the haflaga into the calendar the first time
Once you move the HT icon to the date on which you performed a successful hefsek tahara, and confirm it was done, the program will calculate the number of onot (solid colored and lightly shaded squares) beginning with the night onah immediately following your confirmed hefsek tahara and ending your count with the onah your next flow begins.
Small box/es with the haflaga number/s inside will appear on the yellow colored/shaded date boxes to mark the haflaga onah/onot of anticipation and separation. Solid colored yellow on the left side of the date box with a small square with an odd number inside of it indicates a night onah of separation and a lightly shaded yellow on the right side of the date box with a small square with an even number inside of it indicates a day onah of separation.
Each time a haflaga number is determined; it is always recorded for the current month. It remains on your calendar and is carried over monthly until a subsequent period gives you a greater haflaga number. At that point the greater number cancels all previous haflaga numbers that are smaller than it.
In other words, if your flow comes after any date/s marked with haflaga squares and numbers (haflaga onot), the haflaga numbers corresponding to those dates are cancelled, and are not carried over to the following month.
What if your flow comes after some date/s marked with haflaga squares and numbers (as explained above), but before other, later, date/s on your calendar marked with haflaga squares and numbers?
Those later date/s marked with haflaga squares and numbers are disregarded for the present and do not require separation and bedikot. However, the haflaga numbers on those later date/s are not cancelled. Those haflaga numbers are carried over to the following month and will be marked onto new dates, recalculated once you confirm the newest hefsek tahara.
If your flow begins on a date marked with a haflaga square, its corresponding number is also carried over to the following month. The next date of this haflaga number, however, will be a different one. The program will calculate the new date after the next hefsek tahara has been confirmed.
To paraphrase the above, all previous haflaga numbers greater than or equal to the current month’s haflaga number are carried over to the following month. The dates corresponding to those haflaga numbers will be recalculated from the newest hefsek tahara. Those dates will be marked with the corresponding haflaga squares and numbers as explained above. Any numbers lower than the current month’s haflaga number are cancelled and will not appear in the coming month.
Each couple must abstain from marital relations during the full designated onah of every Hebrew date marked with a haflaga square and number, as long as a new flow did not precede it.
Remember that any date containing a haflagah square with an odd number in it means a separation from sunset to sunrise of that Hebrew date (i.e. if the date marked with an odd number is a Monday, then separation would be from sunset Sunday to sunrise Monday morning).
Any date marked with a haflaga square and an even number in it, means a separation from sunrise to sunset of that Hebrew date (i.e. if the date marked with an even number is a Monday, then separation would be from sunrise Monday morning to sunset Monday evening).
It is praiseworthy to be strict and refrain even from embracing and kissing, and even more so from sharing the same bed. The Alter Rebbe states in his Shulchan Aruch, “He who is stringent in this matter will be blessed.” (A.R.S.A. chapter 184, note 6)
Make a bedikah on the designated onah of every Hebrew date marked with a haflaga square and number, as long as a new flow did not precede it. Your bedikah should be made preferably just after the time of day you experienced your previous flow/s that created each haflaga number or sometime later on, but before the end of the onah. If the bedikah is clear or white, physical intimacy may resume only after the onah has ended. (p. 37 – Kitzur Dinei Tahara)
Although not common, some women can halachically establish a veset kavua. If after several periods any uniformity, progression or pattern in your cycles emerges (e.g. your period begins on the 15th of every Hebrew month during the daytime three times in a row), or if you have any doubt, consult a rav to determine whether or not you have established a veset kavua.
My Mikvah Calendar will detect and inform you of any kavua pattern that may emerge in your cycles. You will receive notice of such a pattern as well as the cycles upon which this discovery was based. Once a set menstrual cycle is established, special halachot apply. A rav or qualified instructor must be consulted.
While My Mikvah Calendar detects and informs of possible kavua situations, it does NOT calculate the kavua for you. You will need to use the Memo system to mark those dates onto your online calendar and receive reminders of them.
For 24 months post birth (or r"l a miscarriage of a pregnancy of 40 days or longer duration) kavua is not an issue and the calendar must be kept as for one who does not have a kavua pattern.
Please note:
If you had a kavuah, even an uprooted kavuah, at the time you conceived, please consult a rav on how this will affect your calendar beginning with the 25th month post birth.
A woman with a Veset Kavuah (established pattern) should consult a rav on how to keep her calendar during pregnancy. A woman with no Veset Kavuah needs to keep the onot of separation that fall within the first three months of pregnancy (calculating from mikvah immersion).
Once she has observed them, she does not carry any of them over. This means that she needs to keep one Onah Beinonit, any Veset Hachodesh dates (these will all be passed in the first month) and all Haflaga Onot that fall within the first three months of the pregnancy. She does not keep a calendar again until she will have her first period post birth. She also does not have to keep any larger Haflaga Onot that may fall past the first three months of the pregnancy.*
There is no need to enter your pregnancy onto the online calendar as it does not affect any calculations. However, it IS important to enter the birth onto the calendar so that the calendar will calculate correctly once you enter the first period post birth.
The first period post birth will give you an Onah Beinonis and a Veses Hachodesh. Once you confirm the Hefsek Tahara from the first period post birth THEN enter the second period, the calendar will calculate a Haflaga number. This number will appear on the correct onah once you confirm the Hefsek Tahara from the second period post birth in your online calendar.
Please note:
If you had a kavuah, even an uprooted kavuah, at the time you conceived, please consult a rav on how this will affect your calendar beginning with the 25th month post birth.
*Note:
Any woman that has any staining or bleeding at any time during the pregnancy MUST consult a rav and be certain to ask him if/how this affects her calendar.
If you are experiencing difficulty becoming pregnant it is essential that you consult with a knowledgeable rav. To contact a rabbi for guidance in matters of fertility please call 347-470-3130 or email projectchai@mikvah.org. The Rabbonim are under the direction and endorsement of Rabbi Y. Farkash, Rabbi Y. Feigelstock and Rabbi Y. Ulman. Confidentiality is assured.
It is very important to realize that the rabbi is here for your benefit. The laws of Family Sanctity are sacred and complex, the rabbi is there to guide you. Do not try to decide things on your own. Bedikot, stains on garments or linens and situations you are unsure of, are reason to consult the rabbi.
If you are not sure whether you have a shayla (question regarding Jewish law), consult a qualified instructor for guidance. Mikvah attendants may be helpful. It is preferable to consult an Orthodox rabbi directly. However, if you are shy, the rabbi’s wife, a mikvah attendant or qualified instructor may ask the rabbi for you. You need not and should not inspect toilet tissue after use. If you did and found something of a questionable color, you must save it and consult an Orthodox rabbi.
When in doubt, do not decide on your own that you are a nidah for it may halachically render you nidah unnecessarily. Conversely, do not decide on your own that you are not nidah.