Formula for calculating the lagna

Format for Calculating Lagna (with example) - (courtesy - Prof. E. Ravindran) Lagna / Ascendant Calculation Input : 1. P.O.B, 2. T.O.B and 3. D.O.B From Lahiri's Indian Ephemeris (page 144 to 158) Place Longitude : Place Lattitude : 1. I.S.T of birth (AM / PM) : h m s 2. LMT correction (where the place longitude/lattitude is available and next column of longitude) 3. LMT at P.O.B (AM / PM) (step 1 + 2) 4. S.T at 12 Noon on Birth Date, Birth Month and Birth Year for 82 deg 30 mins (from Table of Asc : Table no. 1 pg 2 & 3) 5. Correction for Birth Year : (From Table of Asc Table no. 11 page 3 & 4) 6. S.T at 12 Noon on Birth Date, Birth Month and Birth Year for 82 deg and 30 mins (step 4 + 5) 7. Correction for Place of Birth (where the place longitude / lattitude is available and last column) 8. S.T at 12 Noon on Birth Date, Birth Month and Birth Year at the Place of Birth (step 6 + 7) 9. Time interval (TI) between 12 Noon and L.M.T of Birth 00 m 00 s (if L.M.T is PM then T.I is L.M.T itself)

: : :

: : : :

12 h

(-) step 3 : Time Interval : 10. Correction for T.I (from Table of Asc, Table no. 4 page 5) a) for

hours

b) for

mins

: : for

h

m

(a+b)

: 11. The increase in T.I (step 9 + 10) : 12. S.T at the time of Birth (Please see note below)

:

From S.T latitude of place, from the Table of Ascendant, to calculate Lagn a by interpolation method. 13. For For For For

deg North deg North variation deg North

Asc Asc

= = = Mins

Asc =

14. Aynamsa correction (from Table of Ascendant Pg. 6 for Birth Year

:

Note : a) if T.O.B is AM S.T = step 8 - step 11 if step 8 is < step 11, then S.T = (step 8 + 24 hours) - step 11 b) if T.O.B is PM S.T = step 8 + step 11 c) if S.T > 24 hours then subtract 24 hours from it to get S.T d) 1) for southern latitude, add 12 hours to the S.T as Modified Sidereal Time (MST). if M.S.T > 24 hours then subtract 24 hours to get M.S.T 2) for southern latitude, add 6 signs to the Ascendant. If Ascendant is > 12 signs then subtract 12 signs to get the ascendant. Example Calculation Sheet Lagna / Ascendant Calculation Input : 1. P.O.B : Bangalore 2. T.O.B : 11 hours 54 mins (PM) 3. D.O.B : 25.09.1970 From Lahiri's Indian Ephemeris (page 144 to 158) Place Longitude : 77 E 36 Place Lattitude : 12 N 58 1. I.S.T of birth (AM / PM) : 11 h 54 m 00 s 2. LMT correction (where the place longitude/lattitude is available h 19 m 36 s and next column to longitude) 3. LMT at P.O.B (AM / PM) (step 1 + 2) 11 h 34 m 24 s 4. S.T at 12 Noon on Birth Date, Birth Month and Birth Year h 14 m 29 s for 82 deg 30 mins (from Table of Asc : Table no. 1 pg 2 & 3) 5. Correction for Birth Year : (+) 00 h 00 m 11 s (From Table of Asc Table no. 11 page 3 & 4) 6. S.T at 12 Noon on Birth Date, Birth Month and Birth Year h 14 m 40 s for 82 deg and 30 mins (step 4 + 5) 7. Correction for Place of Birth (where the place longitude / ) 00 h 00 m 02 s lattitude is available and last column) 8. S.T at 12 Noon on Birth Date, Birth Month and Birth Year 2 h 14 m 42 s at the Place of Birth (step 6 + 7) 9. Time interval (TI) between 12 Noon and L.M.T of Birth 00 m 00 s (if L.M.T is PM then T.I is L.M.T itself)

: (-) 00 : :

12

:

12 :

:

(+ 1

:

12 h

(-) step 3 : :

11 h

34 m

Time Interval 24 s (since TOB is PM)

10. Correction for T.I (from Table of Asc, Table no. 4 page 5) a) for 11 hours 00 h 01 m 48 s

: (+) : (+) :

b) for 00 h 00 m 06 s

mins

for 00 h 01 m 54 s

h

m

(a+b)

11. The increase in T.I (step 9 + 10) : 11 h 36 m 18 s 12. S.T at the time of Birth (Please see note below) 23 h 51 m 00 s

:

From S.T latitude of place, from the Table of Ascendant, to calculate Lagn a by interpolation method. (Banglaore place latitude : 12 N 58 can be directly looked up in page 20) 13. For 12 deg North For 13 deg North For variation 25 mins

Asc Asc

= 2 sign 9 deg 47 mins = 2 sign 10 deg 12 mins =

Calculation to for 58 mins to get to 12 deg and 58 mins (Bangalore) 1 latitude = 25 mins (from above step 13) therefore 60 mins = 25 mins then 58 mins = 22.30 (or 22 mins 18 secs) = 22 mins For

12 deg North 58 Mins

Asc =

2 sign 09 deg 47 mins (+) 0

sign 00 deg 22 mins --------------------------2 sign 10 deg 09 mins 14. Aynamsa correction (from Table of Ascendant Pg. 6 sign 10 deg 09 mins for Birth Year 1970 (-) 0 sign 0 deg 27 mins --------------------------2 sign 09 deg 42 mins The Ascendant falls in Gemini at 9 degrees and 42 mins

:

2

Note : a) if T.O.B is AM S.T = step 8 - step 11 if step 8 is < step 11, then S.T = (step 8 + 24 hours) - step 11 b) if T.O.B is PM S.T = step 8 + step 11 c) if S.T > 24 hours then subtract 24 hours from it to get S.T d) 1) for southern latitude, add 12 hours to the S.T as Modified Sidereal Time (MST). if M.S.T > 24 hours then subtract 24 hours to get M.S.T 2) for southern latitude, add 6 signs to the Ascendant. If Ascendant is > 12 signs then subtract 12 signs to get the ascendant