Vedic Astrology: Calculation of Vimshottari Dasa


            Predicting an event is a twofold activity. One involves prediction of an event and other is timing of an event. The timing of an event is a hard nut to crack. It is in fact more difficult than predicting an event. However it is the most important part of the prediction.
            The timing of an event involves different methods like transit, progressions and dasa system. The most accurate out of it is the dasa system. The word 'Dasa' means phase or state. The dasa systems are divided into two types 'Graha dasa' and 'Rasi dasa'. In rasi dasa the periods are owned by a different signs where are in Graha dasa periods are owned by different planets. Classical writers have given around 52 dasa systems in Vedic Astrology. But the most common among them is 'Vimshottari Dasa'. Vimshottari dasa is a type of graha dasa. It is our experience that this dasa gives satisfactory results.
            In case of vimshottari dasa total life of human being is considered as 120 years. The period of 120 years is divided among 9 planets including Rahu and Ketu. You may raise the doubt that why 120 years only when there are some persons who live beyond 120 years? The reason is that there are some special combinations which prevail over common combination. In such cases the cycle of 120 years is repeated.
            The sequence of dasa is fixed in every horoscope. But the dasa at birth is different for every native. The dasa at birth depends on the constellation in which the moon is located. Following table shows the birth constellation of moon and dasa at birth.
Constellations


Planet
Years
Kruttika
Uttara
Uttarashadha
Sun
6
Rohini
Hasta
Shravana
Moon
10
Mrugashirsha
Chitra
Dhanishtha
Mars
7
Ardra
Swati
Shatataraka
Rahu
18
Punarvasu
Vishakha
Purvabhadrapada
Jupiter
16
Pushya
Anuradha
Uttarabhadrapada
Saturn
19
Ashlesha
Jyeshta
Revati
Mercury
17
Magha
Moola
Ashwini
Ketu
7
Purva
Purvashadha
Bharani
Venus
20


It is very difficult to state the reason behind the number of years allocated to every planet. But in actual practice it gives accurate results. The planets specified in the above table are called as the owners of a particular constellation. e.g. Sun is the owner of Kruttika, Uttara and Uttarashadha. The dasa or period of any planet is subdivided called as antardasa or sub period. That is why every dasa is divided into 9 parts owned by the nine planets. The first sub period of every dasa is always owned by the lord of the major dasa. e.g. The first sub period of the dasa of Sun is owned by sun only and then others follow in sequential order. e.g. Afer the sub period of sun the sub period of moon will follow and after that the sub periods of all other planets in sequence will follow. The duration of the sub period is in proportion to the period of that planet in the cycle of 120 years. For instance the duration of sun dasa is 6 years in 120 years so the duration of the sub period of sun in Jupiter's dasa is 9 months 18 days and in Moon's dasa is 6 months. We have given the tables of the sub periods in the dasa of the every planet.


Sun's Dasha
6 Years
Planet
Y-M-D
Sun
0-3-18
Moon
0-6-0
Mars
0-4-6
Rahu
0-10-24
Jupiter
0-9-18
Saturn
0-11-12
Mercury
0-10-6
Ketu
0-4-6
Venus
1-0-0
Moon's Dasha
10 Years
Planet
Y-M-D
Moon
0-10-0
Mars
0-7-0
Rahu
1-6-0
Jupiter
1-4-0
Saturn
1-7-0
Mercury
1-5-0
Ketu
0-7-0
Venus
1-2-0
Sun
0-6-0
Mars's Dahsa
7 Years
Planet
Y-M-D
Mars
0-4-27
Rahu
1-0-18
Jupiter
0-11-06
Saturn
1-1-9
Mercury
0-11-27
Ketu
0-4-27
Venus
1-2-0
Sun
0-4-6
Moon
0-7-0

Rahu's Dasha
18 Years
Planet
Y-M-D
Rahu
2-8-12
Jupiter
2-4-24
Saturn
2-10-6
Mercury
2-6-18
Ketu
1-0-18
Venus
3-0-0
Sun
0-10-24
Moon
1-6-0
Mars
1-0-18
Jupiter's Dasha
16 Years
Planet
Y-M-D
Jupiter
2-1-18
Saturn
2-6-12
Mercury
2-3-6
Ketu
0-11-06
Venus
2-8-0
Sun
0-9-18
Moon
1-4-0
Mars
0-11-6
Rahu
2-4-24
Saturn's Dasha
19 Years
Planet
Y-M-D
Saturn
3-0-3
Mercury
2-8-9
Ketu
1-1-9
Venus
3-2-0
Sun
0-11-12
Moon
1-7-0
Mars
1-1-9
Rahu
2-10-6
Jupiter
2-6-12

Mercury's Dahsa
16 Years
Planet
Y-M-D
Mercury
2-4-27
Ketu
0-11-27
Venus
2-10-0
Sun
0-10-6
Moon
1-5-0
Mars
0-11-27
Rahu
2-6-18
Jupiter
2-3-6
Saturn
2-8-9
Ketu's Dahsa
7 Years
Planet
Y-M-D
Ketu
0-4-27
Venus
1-2-0
Sun
0-4-6
Moon
0-7-0
Mars
0-4-27
Rahu
1-0-18
Jupiter
0-11-18
Saturn
1-1-9
Mercury
0-11-27
Venu's Dasha
10 Years
Planet
Y-M-D
Venus
3-4-0
Sun
1-0-0
Moon
1-8-0
Mars
1-2-0
Rahu
3-0-0
Jupiter
2-8-0
Saturn
3-2-0
Mercury
2-10-0
Ketu
1-2-0
            There is also an alternative method for calculating the sub-period. Multiply the number of years allocated to lord main dasa lord by the years allocated to the sub-lord in question. Multiply the digit in the units place by 3. The number in the Ten's and Hundred's place denotes months while the number in the units place multiplied by 3 denotes days. e.g. if we want to calculate the Saturn's sub period in Jupiter dasa. Multiply by 19 (Saturn's sub-period) to 16 (Jupiter's main dasa period) the result is 304. Multiply 4 by 3. 12 is the result. 3 & 0 are the numbers in the Ten's & Hundred's place. So the number becomes 30 months and 12 days for the Saturn's sub period in Jupiter's. Thus Saturn's sub-period in the Jupiter's dasa is 2 years 6 months and 12 days. The same holds true for Jupiter's sub period in Saturn's dasa.
            The duration of the dasa at birth is proportional to the traverse of moon in a particular constellation. For instance, moon is in krittika and traversed half of the constellation, the dasa of sun at birth will be half of the total duration i.e. The sun dasa at birth will be only 3 years and the dasa of moon will follow it.
The next question would be in case of the dasa of birth how the sub periods are calculated. The answer is sub period at birth will be the sub period which would be after 3 years in sun dasa i.e. of Saturn and all other sub periods after that follow in the same order. The dasa passed before birth is called as 'bhukta' dasa and the dasa which comes after the birth is called as 'bhogya' dasa. The sum of bhukta and bhogya dasa is always equal to the total duration of the planet's dasa.
Let us caculate the bhukta and bhogya period at 1st July 2001 at 6.00 PM
The position of moon is Libra 28 deg 12 min. So the constellation is Vishakha. If we see table 1 then dasa at birth is of Jupiter. Total duration of Jupiter's dasa is 16 years. If you refer to our lecture 4 Vishakha starts at 20th degree of Libra. So moon has passed
28 deg 12 min - 20 deg 00 min = 8 deg 12 min in Vishakha
We will have to calculate by the law of three how much is bhukta and how much is bhogya
For 13 deg 20 min 16 Years
Then For 08 deg 12 min ?
The result is 9 years 10 months and 1 day is the bhukta (passed) at birth, and 6 years 1 month and 29 days is bhogya (to be passed). This means that the Jupiter has already started 9 years 10 months and 1 day before the birth date. i.e. It started on August 8th, 1991 and it will end on August 7th , 2001 so if we add the duration of all the sub periods up to July 1,2001 Venus sub period (bhukti) is on & passing it ends on March 12, 2002. and Sun's sub period follow after that. The following table demonstrates this. In following table we have also shown all the dasas and their sub periods.

Main Dasa Sub periods
Jupiter  8-30-1991  Sa 12-12-91      Me  4-13-92     Ke  8-02-92  Ve 9-16-92
 Su  1-24-93        Mo  3-04-93      Ma  5-08-93     Ra 6-22-93
Saturn  10-17-1993  Me  3-13-94      Ke  7-22-94     Ve  9-14-94  Su 2-15-95
 Mo     4-02-95      Ma  6-18-95     Ra  8-11-95     Ju12-28-95
Mercury 4-29-1996   Ke  8-25-96     Ve 10-12-96     Su  2-27-97   Mo 4-09-97
 Ma      6-17-97     Ra  8-05-97     Ju 12-07-97     Sa  3-27-98
Ketu    8-05-1998   Ve  8-25-98     Su 10-21-98     Mo 11-07-98   Ma 12-06-98
 Ra      12-25-98    Ju  2-15-99     Sa  4-01-99     Me 5-25-99
Venus   7-12-1999   Su 12-22-99     Mo  2-08-00     Ma  4-29-00   Ra 6-25-00
 Ju      11-18-00    Sa  3-28-01     Me  8-29-01     Ke 1-14-02
Sun     3-12-2002   Mo  3-27-02     Ma  4-20-02     Ra  5-07-02   Ju 6-20-02
 Sa      7-29-02     Me  9-13-02     Ke 10-25-02     Ve 11-11-02
Moon    12-29-2002  Ma  2-08-03     Ra  3-08-03     Ju  5-21-03   Sa 7-24-03
 Me      10-10-03   Ke 12-18-03     Ve  1-15-04     Su 4-05-04
Mars    4-29-2004  Ra  5-19-04     Ju  7-10-04     Sa  8-24-04   Me 10-17-04
 Ke      12-04-04   Ve 12-24-04     Su  2-19-05     Mo 3-08-05
Rahu    4-05-2005  Ju  8-15-05     Sa 12-10-05     Me  4-28-06   Ke 8-30-06
 Ve      10-20-06   Su  3-15-07     Mo  4-28-07     Ma 7-10-07

            The sub periods are further subdivided into minute divisions called antaras or inter periods. This division goes on till swara or the time taken for one inhale and exhale. But for all practical purposes we can go till antaras. The duration of antara is calculated in the same manner as sub-period is calculated.
Let us calculate Venus antara in moon sub period of saturn dasa.
The duration of moon sub period in Saturn dasa is 19 months
So the duration of venus antara is = 19 * 20/120 = 19/6 months = 3 months 5 days.
Like this you can calculate for all the sub periods. The results of the periods will be discussed later in the course.
Exercise: Calculate the dasa bhuktis and antaras for your horoscope.

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