DASA BHUKTI ANTARA:
Astrologers generally adopt dasa system for judging the nature of events for the native or to time events. Every individual has to pass through different periods of good and bad days. The astrologer while analyzing the horoscope basically dependents on dasa/bhukti/antara periods arrived from the birth chart [ or horary] This helps in knowing mot only past events of the native. but also pin pointing future events Say in order to ascertain the best period or exact period when a native will get job or get parried etc, the relevant favorable dasa bhukti antara period are marked by the astrologer for prediction after studying the chart in detail.
Total life span of a native was fixed at 120 years. There is no clear clue why total dasa period adopted as 120 years. Astrologers in the pastmight have taken the optimum longevity of a native in those periods as basis. Even know a percentage of population cross century..
Each Star lord is allotted fixed no of Solar years. Total solar years ie 120 years is distributed among 9 stars as under.
KETU—7YEARS, VENUS—20 YEARS,SUN7 YEARS, MOON10 YEARS MARS7 YEARS,RAHU18 YEARS, JUPITER16 YEARS SATURN—19 YEARS, MERCURY—17 YEARS
The period may also be called as total DASA period of each planet.
Dasa of a native starts right from his birth. It is calculated based on Moon position at the time of birth The exact longitude of Moon and the constellation in which it is deposited is noted along with the star lord or Constellation lord.
For example
In a native chart Moon is posted in Taurus sign @17.d 34min. we can say it is in moon star Rohini. [ 010 deg belong to sun star krithika .in Taurus ] and it has already traveled 7d.34m
Each star longitude is 13d.20m or 800 minutes. Here moon has traversed 454 minutes and balance moon dasa will be 346 minutes in the star Rohini If one has to calculate balance das at birth it will be 346/800 x10 = 4.325 years or 4 years.3m.27d. [ minutes traversed in the star dived by total minutes for the star multiplayer by dasa period of the star in question]
here readers may ref ready beckoner books available in the market one can also adopt simple formula without reference to books dasa period for all planets
&PLANET 
FOR 1DEG Lon Y .M .D 
FOR 1 MIN Lon .M.D 
PLANET 
FOR 1DEG Lon Y. M. D 
FOR 1 MIN Lon .M .D 
PLANET 
FOR 1DEG Lon Y. M .D 
FOR 1 MIN Lon .M .D 
KETU

0.06.09

0.08

MOON

0.09.00

0.05

JUPITER

1.02.12

0.07

VENUS

1.06.00

0.09

MARS

0.06.09

0.03

SATURN

1.05.03

0.09

SUN

0.05.12

0.03

RAHU

1.04.06

0.08

MERCURY

1.03.09

0.08

If we use the above table for above example
For Moon dasa longitude 13.20 –7.34 = 546 deg balance @ birth
5 x 0.9.0 y = 3y09m.00d
46 x 0.05 = 0y.06m.27d

4y03m.27
After initial dasa at bitrth, next dasa will follow in a fixed order of dasa periods. So in this case after moon it will be mars dasa ,next rahu ,Jupiter, sat, mer, ketu ,venu, and last sun dasa to complete the chain or cycle of dasa periods.
Bhukti:
Dasa of each planet is sub divided into Bhukti and further into antara, sookshma.
These sub divisions are available in the astrology books. Nemji garu we may consider giving the table of dasa bukti antara from software
However it can be also be arrived at by simple formulas Bhukti
Running Dasa period x dasa period of the required bhukti
The result will be in months represented by first two digits and the third digit should be multiplied by 3 [3 is constant] to get days.
For example let us take venus dasa and various bhukti Venus dasa is of 20 years So venus bhukthi will be 20 x 20 = 400. {40 months or 2years and 6 months. Third digit here is zero so nil days } 2years 6 months.
Next .
Sun bhukti 
20x 6 
= 
120 
that is 
1year 
Moon bhukti 
20x10 
= 
200 
or 
1year, 8months 
Mars bhukti 
20x7 
= 
140 
or 
1year, 2months 
Rahu bhukti 
20x18 
= 
360 
or 
3years 
Jupiter bhukti 
20x16 
= 
320 
or 
2years, 8months 
Saturn bhakti 
20x19 
= 
380 
or 
3years, 2months 
Mer bhukti 
20x17 
= 
340 
or 
2years, 2months 
Ketu bhukti 
20x7 
= 
140 
or 
1year, 2months 






Let us take mercury dasa which is 17 years Bhukthi will be 






Mer 
17x17 
= 
289 
first 2 digits 28 months so 2y.4m and third digit is 9 so 9x3 = 27Days. Mer bhu in mer dasa will be 2y.4m.27 days 
Ket 
17x7 
= 
119 
11months and 27 days [9x3] 
Ven 
17x20 
= 
340 
ven bhukti 2y.10m. 0 days Ketu buhkti 0y.11m.27d. 
Sun 
17x6 
= 
102 
sun bhukti 10m. 6d [2 x 3] 
Moon 
17x10 
= 
170 
moon17 months. or 1y.5m.0d 
Mars 
17x7 
= 
119 
mars bhulti 11 month 27d[9 x 3 ] 
Rahu 
17x18 
= 
306 
rahu bhukti 30mnths or 2y.6m.18d [5 x 3 ] 
Jup 
17x16 
= 
272 
hup bhukti 27 months or 2y.3m.6d [ 2x3] 
Sat 
17x19 
= 
323 
sat nhukti 32m or 2y. 8m.9d [ 3x3 ] 
Antara:
Now to calculate antara
Formula is running dasa period x bhukti x antar dasa /40[40 constant]
Result will be in days
Ex for ven dasa,venus bhkthi,venus antara , 20x20x20 =8000/40 =200 days 0y.6m.20d
Sat dasa.venus bhukti and mars anttara
19x20x16 =2660 did by 40 = 66.5 days or 0y.2m.6d.12hours
Sookshma:
Now to calculate
Dasa x bhukti x antara x sookshma periods divided by 200 [200 constant ]
result will be in hours.
Ven x vn ven ven
20x20x20x20 /200 =1,60,000/200 =800 hurs or 1m3d
